Great Crested Flycatcher

The great crested flycatcher (Myiarchus crinitus) weaves shed snakeskin into its nest. The running theory involves scaring off predators who peek into the cavity and see what appears to be a snake already in residence. Whether this actually fools squirrels and rat snakes remains debated. The great crested flycatcher was doing it anyway, for longer than anyone was studying the behavior, and shows no sign of reconsidering the décor. Breeding across every parish in North Louisiana from April through August, nesting in tree cavities in mature hardwood and mixed forest. Two things set it apart from every other eastern flycatcher: it nests in holes instead of building open cups, and it actually has color. A lemon-yellow belly, a rufous tail, an olive-gray back, and a peaked crest give the great crested flycatcher a look that the other flycatchers in North Louisiana did not bother to assemble. The eastern phoebe wears gray. The wood-pewee wears gray. The great crested flycatcher showed up to the same family reunion in a sport coat. The Look Olive-gray above, bright lemon-yellow below, with rufous inner webs on the tail and wing feathers that flash during flight and aggressive displays. The peaked crest gives the head a disheveled, just-woke-up silhouette that no amount of preening corrects. The bill comes heavy and broad, built for catching insects on the wing and crushing beetle shells with the casual efficiency of someone stepping on a cracker. Gray throat and upper breast transition to yellow on the lower breast and belly. The color split happens cleanly enough to work as a field mark at moderate distances. A bird with a gray chest and a yellow belly sitting upright on an exposed canopy branch belongs to this bird in North Louisiana unless something extraordinary happened. The rufous tail, visible from below when the bird fans it during landing, confirms the ID and adds warmth that the word "flycatcher" does not prepare you for. Juveniles carry the same pattern, just duller. Paler yellow. Less rufous contrast. Lower crest. But the shape, the posture, and the habit of sitting upright on high exposed perches match the adult from the first week out of the nest. The rufous in the wings and tail deserves specific attention because the rufous creates the flash that catches the eye at canopy height. A perched great crested flycatcher tucks the rufous under the olive back, showing only a hint of rust at the wing edge. A flying great crested flycatcher spreads the wings and fans the tail, and the rufous panels light up against the green canopy in a way that no other flycatcher in North Louisiana matches. The color transforms in flight from "mostly olive bird" to "bird with warm rust panels on every wing surface." The transformation happens fast enough that first-time observers frequently describe the flying bird and the perched bird as two different species until someone explains that the same bird changes its visible color palette depending on whether the wings fold or spread. The Sound A loud, rising "WHEEP!" that cuts through the canopy and announces the bird from a hundred yards away. The call has startled hikers, interrupted phone conversations on forest trails, and caused more than one person to scan the treetops for something considerably larger than the one-ounce bird that actually produced it. The call carries authority. The source does not. Dawn adds a rolling, burry "prrrEET" repeated from a high perch before sunrise. The predawn performance lasts about twenty minutes and amounts to aggressive real estate marketing. The bird staked a claim and plans to enforce it before the neighbors finish waking up. A softer "whit" handles close-range communication between mates and between adults and fledglings. The "whit" lacks the volume of the "WHEEP!" and sounds almost polite by comparison, which makes it the only sound the great crested flycatcher produces that could be described with that word. What's on the Menu Flying insects caught in midair from an exposed perch. The great crested flycatcher hunts by sitting still on a high, dead branch, scanning the air, and launching after anything that flies past within range. Beetles, moths, butterflies, dragonflies, wasps, and flies all get snatched. The bird returns to the same perch after each catch, which makes the hunting pattern predictable and the perch easy to find once you've spotted the first sortie. Late summer and fall add fruit. Berries and small fruits supplement the insects as bug availability drops. A great crested flycatcher eating berries off a dogwood in September did not abandoned its principles. The menu changed because the specials changed. Large beetles and hard-bodied insects get beaten against the perch before swallowing. The bird grabs the beetle, returns to the branch, and whacks the insect against the wood until something cracks. The technique carries the subtlety of a ball-peen hammer and about the same success rate. The hunting perch sits high, typically at the top of a dead branch in the upper canopy where the bird carries a clear view of the surrounding airspace. The perch selection follows a logic that prioritizes sightlines over comfort: the highest dead branch with an unobstructed view of the gap between trees wins. The bird sits upright on this perch, head swiveling, and launches the moment an insect enters the intercept zone. The sally covers five to thirty feet of air, the bill snaps with an audible click, and the bird loops back to the same branch. The entire sequence takes about three seconds. The perch-to-perch fidelity makes the great crested flycatcher one of the easiest canopy birds to relocate after the first sighting. The branch did not moved. The bird came back to it. A single great crested flycatcher defends the airspace around its hunting perches against other insect-catching birds. A red-eyed vireo that wanders too close to the flycatcher's preferred dead branch gets chased. A Carolina wren that perches within the declared zone gets scolded. The flycatcher did not post a sign. The flycatcher does not need a sign. The "WHEEP!" functions as the sign, the boundary, and the enforcement notice rolled into one. How It Actually Lives Cavity nester. The only eastern flycatcher that nests in holes. The female picks the cavity, and the pair fills it with leaves, bark strips, fur, feathers, and the signature snakeskin. In areas where shed skins aren't handy, the bird substitutes plastic wrappers, onion skins, and cellophane, which suggests the attraction involves texture and translucency rather than any anti-predator angle. A bird that replaces snakeskin with a Snickers wrapper has moved past function into territory nobody can fully explain. She lays four to eight eggs. Both adults feed the chicks, though the female handles most incubation. Chicks fledge after about two weeks in the cavity and depend on the adults for food and protection for several weeks after leaving. The begging call sounds exactly how you'd expect: insistent, loud, and completely indifferent to everyone else's schedule. Migration takes the bird to southern Mexico, Central America, and northern South America for the winter. The great crested flycatcher that nested in your backyard oak in Lincoln Parish in June spent December in Guatemala. The commute did not shortened. The bird never requested remote work. The pair bond lasts one breeding season. Great crested flycatchers do not mate for life the way sandhill cranes do. A male and female that nested together in a Lincoln Parish oak in 2024 may pair with different mates in 2025, even if both birds return to the same forest. Site fidelity brings the birds back to the same general area. Mate fidelity does not guarantee the same partner. The bird returns to the neighborhood, not to the relationship. A great crested flycatcher checking cavities in April shows more interest in the quality of the hole than the identity of the bird in the adjacent tree. The chicks beg loudly from inside the cavity, producing a buzzy, insistent call that carries through the cavity wall and announces the nest location to anything within earshot, including snakes and squirrels. The begging call represents a trade-off: the louder the chick calls, the more food the adults deliver, but the louder the chick calls, the more predators learn the nest's location. The chick that begs loudest eats most. The chick that begs loudest also advertises the nest most effectively to every rat snake in the neighborhood. Evolution has settled on the louder option, which tells you how heavily the food advantage outweighs the predator risk. The Snakeskin Question (Nobody Has Answered It) The snakeskin behavior gets mentioned in every great crested flycatcher article, every field guide entry, every nature documentary segment. The behavior also remains unexplained to everyone's satisfaction after decades of study. The bird weaves shed snakeskins into the nest lining. Every great crested flycatcher does this. First-year birds doing it for the first time do it without instruction. The behavior comes pre-installed, which means the wiring for "find translucent, crinkly material and put it in the nest" survived natural selection long enough to become universal in the species. The leading theories: the snakeskin deters cavity-raiding predators by mimicking a live snake's presence. The snakeskin provides antimicrobial properties from residual proteins. The snakeskin improves nest insulation. None of these theories have been proven conclusively. All of them have attracted enough supporting evidence to avoid being dismissed. The bird may stuff snakeskins in the nest for one of these reasons, all of these reasons, or a reason nobody has thought to test. The substitution evidence complicates the predator-deterrence theory. In areas where shed snakeskins do not occur readily, the bird substitutes plastic wrap, cellophane, onion skins, fish skins, and any other material that matches the translucency and crinkle of snakeskin. A great crested flycatcher in a suburban yard was documented incorporating a Snickers wrapper into the nest lining. A different nest contained a piece of clear packing tape. A third contained a section of shed cicada exoskeleton. None of these substitutes resemble a snake to any predator that has actually seen a snake. The substitutions suggest the bird responds to a material property, translucent, crinkly, flexible, rather than to the specific identity of the object as snakeskin. The debate will continue because the bird did not provided testimony and carries no plans to start. The behavior persists. The research papers accumulate year after year. The great crested flycatcher was running this experiment for millions of years and did not released the findings. The Cavity Shortage The great crested flycatcher cannot drill its own cavity. The bird depends entirely on holes that other species made or that trees produced through rot, storm damage, and age. Every woodpecker hole, every natural hollow, every knot that fell out and left a gap in the trunk becomes potential real estate for a bird that carries no ability to create its own. The competition for these cavities in North Louisiana's hardwood forests involves eastern bluebirds, tufted titmice, Carolina chickadees, Carolina wrens, flying squirrels, and the great crested flycatcher, all looking at the same holes and all arriving at the same conclusion: that one works. The flycatcher's size gives it an advantage over the smaller cavity competitors. A great crested flycatcher can displace a chickadee or a titmouse from a cavity through aggression and persistence. The flycatcher cannot displace a red-bellied woodpecker or a European starling, both of which outweigh the flycatcher and will hold a cavity against it. A starling that claims a cavity entrance before the flycatcher arrives wins the hole for the season. The starling has won this fight across North Louisiana repeatedly, and the great crested flycatcher's nesting options shrink every year as starling populations hold steady and natural cavities in old-growth trees continue to disappear. Nest boxes with a 1.75-inch entrance hole attract great crested flycatchers and exclude starlings, which need a 1.5-inch hole minimum but prefer larger. A properly sized box mounted ten to fifteen feet up on a pole or tree in or near mature hardwood forest fills the cavity gap for one pair per box. The bird takes to nest boxes readily, stuffs the snake skin into the box lining just the same way it would in a natural cavity, and raises its brood without any apparent preference for the natural option over the artificial one. A cavity equals a cavity. The bird never expressed a preference for ambiance. The Migration That Nobody Talks About The great crested flycatcher makes a migration that gets overshadowed by the more dramatic crossings of warblers and shorebirds but covers just as much distance and crosses just as much open water. The bird winters from southern Mexico through Central America and into northern South America, which means a great crested flycatcher that spent June in Lincoln Parish spends January in Honduras or Costa Rica or Colombia. The fall departure from North Louisiana happens quietly between late August and early October, with the birds slipping out of the canopy one at a time rather than gathering in visible staging flocks. Spring arrival runs just as quiet. One morning in mid-April, the "WHEEP!" appears in the hardwood canopy, and the bird was back for hours or days before anyone noticed. The arrival lacks the drama of a sandhill crane flock or the flash of a painted bunting's first appearance. The great crested flycatcher's arrival announcement consists entirely of the call, delivered from a dead branch seventy feet up in an oak, aimed at the forest in general. The forest was informed. The forest may proceed accordingly. The Gulf crossing, approximately six hundred miles of open water with no rest stops, applies to the great crested flycatcher just as it applies to every other Neotropical migrant. A bird that weighs about an ounce stores enough fat in the days before departure to power a nonstop overnight flight from the Yucatan Peninsula to the Louisiana or Texas coast. The fat reserve represents roughly half the bird's departure weight. The bird arrives on the Gulf Coast lighter, hungrier, and immediately ready to start catching insects. The first flying beetle taken after a six-hundred-mile flight over open ocean must taste extraordinary. The bird never shared its opinion on the matter. Territory and the Anger Behind the WHEEP The great crested flycatcher defends territory with a persistence that the bird's relatively calm perch-hunting demeanor does not suggest. A nesting pair claims three to six acres of hardwood forest and enforces the boundary against every other great crested flycatcher that approaches. The enforcement involves aerial chasing, loud calling, crest-raising, and physical contact. Two male great crested flycatchers fighting over a territory boundary produce a tangle of olive-green feathers, yellow bellies, and outraged "WHEEP!" calls that looks more chaotic than strategic. The fights typically last under thirty seconds. The loser retreats. The winner returns to the perch and resumes calling as though the interruption was minor. The aggression extends to other species that approach the nest cavity. Blue jays, red-bellied woodpeckers, and European starlings all get chased from the vicinity of an active nest. The flycatcher's size disadvantage against these species does not prevent the attempt. A great crested flycatcher diving at a blue jay's head from above produces a confrontation that the jay did not expect and does not enjoy. The flycatcher won't win a sustained physical fight with a jay. The flycatcher doesn't need to win. The flycatcher needs the jay to decide the cavity isn't worth the headache, and the diving attacks usually accomplish that goal within three or four passes. The female defends the cavity interior. A predator or competitor that reaches the entrance hole encounters the female inside, bill first, in a space too confined for the intruder to maneuver. A flying squirrel that sticks its head into an occupied great crested flycatcher cavity will get a bill strike to the face in a space the size of a coffee mug. The interior defense was observed through nest cameras and documented in published research. The female never once been described as hesitant in any of those studies. Who Gets Mistaken for Who Brown-crested flycatchers. A western species that barely reaches the edge of the area. The field guides place it next to the great crested and the visual similarity creates anxiety for birders who read field guides before bed. Bill size, call differences, and range settle it. In North Louisiana, any crested flycatcher in a tree cavity belongs to the great crested unless documentation proves otherwise. Ash-throated flycatchers. Another western species that does not show up in North Louisiana with regularity. Same anxiety source, same solution: range and voice. The real shortcut: a "WHEEP!" from the canopy in June belongs to the great crested flycatcher. No other bird in North Louisiana makes that call. The voice handles the ID before the binoculars come up. Eastern kingbird. Both species hunt from exposed perches, both species are aggressive, and both species occur across all of North Louisiana during summer. The kingbird wears dark gray-black above with a clean white belly. The great crested wears olive and yellow. The kingbird hunts from fence posts in open country. The great crested hunts from dead branches in forest canopy. The habitat difference alone sorts them: open field equals kingbird, forest canopy equals great crested. If both birds somehow share a forest edge perch, the yellow belly on the great crested and the white belly on the kingbird settle it in one look. What Eats It (And What Tries) Cooper's hawks and sharp-shinned hawks take flycatchers from perches. The habit of sitting on exposed dead branches at canopy height puts the bird in direct hawk sightlines. The defense involves the same aggressive personality that drives territorial behavior: great crested flycatchers mob hawks, scream at cats, and chase crows with the confidence of a bird that weighs six times what it actually weighs. Rat snakes raid nest cavities. The snakeskin in the nest may or may not deter the snake that produced the skin. Nobody has tested whether a rat snake encountering its own shed skin in a cavity would hesitate, reconsider, or simply proceed with dinner. Designing that experiment would require a level of snake-cooperation that snakes have historically not provided. Cowbirds parasitize nests occasionally, but the deep cavity and the bird's aggressive defense reduce the success rate. A cowbird attempting to enter an occupied great crested flycatcher cavity faces an angry bird with a heavy bill in a confined space, which amounts to a home invasion where the homeowner saw you coming and chose violence. Why the Old Trees Matter No cavities, no nesting. A forest managed on short rotation that removes trees before they develop natural holes eliminates nesting habitat. Mature hardwood stands with standing dead snags carry great crested flycatcher populations. Nest boxes supplement natural cavities, and the bird accepts them readily, but boxes supplement old trees. They don't replace them. A neighborhood that clears old oaks and replants with ornamental pears has traded a cavity-nesting flycatcher habitat for a tree no flycatcher can use. The bird's presence in a neighborhood tells you something about the age of the trees. Young neighborhoods don't have them. Old ones do. The bird moved in when the trees got old enough to develop holes, and the bird has seniority over most of the residents. Dead standing trees, snags, produce the best cavities for great crested flycatchers because the wood softens as it decays, and the flycatcher can modify the interior of a soft-wood cavity more easily than a hard-wood one. A landowner who removes dead trees from a woodlot for aesthetics or firewood removes exactly the resource the flycatcher needs most. The tree that looks worst to the homeowner, dead, bark peeling, possibly leaning, looks best to the flycatcher. The bird's real estate priorities invert the human ones completely. The ugliest tree on the property may hold the best cavity in the territory. The best conservation advice for the great crested flycatcher fits on a bumper sticker: leave the dead tree standing. Leaving dead trees standing, maintaining mature hardwood stands, and installing nest boxes in younger forests where natural cavities have not yet developed all contribute to great crested flycatcher persistence in North Louisiana. The cost of maintaining the bird amounts to the cost of not cutting down a dead tree, which may be the cheapest conservation measure in all of North Louisiana wildlife management. Where to Look Any mature hardwood or mixed forest in North Louisiana between April and August. D'Arbonne National Wildlife Refuge, Chemin-a-Haut State Park, Poverty Point Reservoir State Park, and Lincoln Parish Park all carry breeding populations. The "WHEEP!" call announces the bird. Follow the sound to a dead branch at canopy height, and the bird will be sitting upright on the end of it, scanning for the next insect to make a poor decision. Suburban neighborhoods with mature oaks, pecans, and hickories that have developed natural cavities also hold the species. A great crested flycatcher nesting in a dead limb above a Ruston sidewalk did not left its habitat. The habitat includes the sidewalk, because the tree above it got old enough to develop holes. Early morning between 5:30 and 7:30 AM in May and June produces the most vocal activity. The bird calls from multiple perches across the territory during the pre-dawn and dawn period, and the "WHEEP!" output during this window exceeds the rest of the day's calling by a factor that makes midday visits seem quiet. A birder standing at the edge of D'Arbonne NWR's hardwood bottomland at 6:00 AM in May will hear great crested flycatchers calling from every direction, each bird marking a separate territory, each territory defined by the sound of a bird that wants every other bird in the forest to know exactly where the line falls. Where to Learn More The Cornell Lab of Ornithology's All About Birds covers the great crested flycatcher with range maps, call recordings, and nesting ecology. The Sibley Guide to Birds places the Myiarchus flycatchers side by side for the comparison that sorts great crested from brown-crested from ash-throated. Snakeskin research fills a surprisingly entertaining corner of the literature. Published studies on nest material selection document the bird's willingness to substitute synthetic materials for snakeskin, and the findings raise more questions about the behavior than they answer. Experiencing This Bird: Accessibility Notes The great crested flycatcher's "WHEEP!" call sits at a mid-range frequency that most people hear clearly, including people who've lost the high frequencies. The sound carries a hundred yards or more through hardwood forest and cuts through the background of other songbirds. One call tells you the bird arrived. Two or three in quick succession tell you the bird found something to yell about. For people with mobility limitations, the perch-hunting habit helps. The great crested flycatcher picks an exposed branch and stays on it for repeated hunting flights, returning to the same spot over and over. Any forest road, trail edge, or parking area near mature hardwoods between April and August can produce the bird by ear within minutes. The bird that made the call will still be sitting on the branch that made the call possible.

Accessibility

The great crested flycatcher's "WHEEP!" call sits at a mid-range frequency that most people hear clearly, including people who've lost the high frequencies. The sound carries a hundred yards or more through hardwood forest and cuts through the background of other songbirds. One call tells you the bird arrived. Two or three in quick succession tell you the bird found something to yell about.

For people with mobility limitations, the perch-hunting habit helps. The great crested flycatcher picks an exposed branch and stays on it for repeated hunting flights, returning to the same spot over and over. Any forest road, trail edge, or parking area near mature hardwoods between April and August can produce the bird by ear within minutes. The bird that made the call will still be sitting on the branch that made the call possible.