Did you know that female ruby-crowned kinglets can lay clutches of eggs that weigh the same as they do?
Ruby-crowned kinglets are often confused with golden-crowned kinglets because both are tiny birds with gray and olive coloration. Ruby-crowned kinglets lack the black and white stripes on their faces that golden-crowned kinglets have. Male ruby-crowned kinglets have red on their heads. Female ruby-crowned kinglets do not have a patch on their heads.
Ruby-crowned kinglets are often confused with orange-crowned warblers because both are small, olive birds with brightly colored crowns. Ruby-crowned kinglets are smaller with red crowns. Orange-crowned warblers have orange crowns.