Black-throated Blue Warbler

Male Black-throated Blue Warblers are a lovely rich blue color on the back and white underneath. They are unusual amongst the predominantly yellow warblers. Females are very plain in comparison and are grayish-olive.

  • Setophaga caerulescens
  • Length: 4.3-5.1 in (11-13 cm)
  • Weight: 0.3-0.4 oz (8-12 g)
  • Wingspan: 7.5-7.9 in (19-20 cm)


Black-throated Blue Warblers breed in northeastern US states and Canada. They can also be seen during migration over eastern US states before wintering in Central America and the Caribbean.

Habitat And Diet

You can find Black-throated Blue Warblers in lower areas of deciduous forests, shrubby areas, and sometimes backyards looking for spiders, flies, and caterpillars.

Black-throated Blue Warblers Song:


Nests of Black-throated Blue Warblers are hidden in dense shrubs and made from bark held together with spiders’ webs and saliva. The nest is lined with animal hair and pine needles.

They lay up to five eggs which take about two weeks to hatch and ten days for the young to leave the nest.

Fun Fact:

Black-throated Blue Warblers listen out for males singing after the breeding season as this shows areas where males were successful as unsuccessful males do not sing.