Regulus calendula HOW TO IDENTIFY: * Length: 3.75 inches * Very small, active bird that often flicks its wings * Thin bill * Broken eye ring * Olive upperparts * Pale olive underparts * White wing bars * Yellow edges to flight feathers and tail * Male has red patch in center of crown (not always visible) Similar species: The Hutton's Vireo is very similar in plumage but has a thicker bill. The Golden-crowned Kinglet is similar in size to the Ruby-crowned Kinglet but has a white supercilium and yellow crown. Warblers are larger, don't flick their wings and lack the broken eye ring.
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