Wilson's Warbler

Wilson's warbler

Wilsonia pusilla

Description: 4 1/2-5" Adult male olive green above and yellow below, with black crown patch, most females and all young birds lack black crown, and may be distinguished from other olive green warblers with yellow underpats by lack of wing bars, tail-spots or other markings Habitat: . Moist woodland edges, willow thickets, spruce-tamarack bogs, alders or birches near streams and ponds, tangles near water. More numerous in the west. 
Nesting: 4-5brown-spotted white eggs in a bulky mass of leaves, rootlets and moss, lined with hair and fine plant material concealed on the ground in dense clump of weeds Range: breeds  from Alaska east across Canada and California, winters in tropics
Voice: a rapid staccato series of chirps, which drop in pitch at the end Diet: insects and occasionally berries

Notes: Very active little bird, twitches tail and flicks wings usually seen within 10 feet of the ground, can be bold
When present in Oklahoma: present in state only during migration

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