black-throated green warbler

adorable amazing animal audubon beautiful beauty behavior biology bird birding black branch cautious close colorful connecticut curious cute dendroica ecology field foraging forest friendly green growth happy head incredible leaflets life little migrant natural nature new ornithology outdoors pattern perched pretty research scenery science seasonal serene sided skittish songbird species spring study summer territorial throated tree uncommon unique unusual virens warbler warblers watching wild wildlife woods world yellow zoology