This is the call of the yellow warbler, also sometimes referred to as the summer yellowbird.
And the name says it all! These birds are most easily distinguishable by their bright, sunny feathers and red streaks on their breasts. Males are distinguished by a brighter coloration.
Habitat: Occupying a wide range, yellow warblers breed through northern and central North America. In the winters, they migrate to central and northern South America. They breed in areas with dense growth nearby wetlands.
Diet: Yellow Warblers (Setophaga petechia) feed primarily on caterpillars which make up 60% of their diet, and will also consume other insects such as beetles, damselflies, and wasps. They capture their prey through gleaning (picking from foliage) or by hawking (capturing mid-flight). In the winter, American yellow warblers who have flown south enjoy berries and other small fruits in addition to insects.
Adaptations: Yellow warblers face risk of predation from many animals including: snakes, skunks, foxes, squirrels, crows, hawks, and blue jays. To make up for their small size, they have been observed mobbing with other bird species to defend from predators.
Warblers also face risk of being parasitized by cowbirds who lay their eggs inside the nests of warblers. It is estimated that about 40% of all yellow warbler nests have experienced successful or attempted parasitism from brown-headed cowbirds. However, the yellow warbler is one of the only passerine that is proven to sometimes be able to recognize a parasite egg in its nest. In this case, it will either build a new layer and smother its first nest- abandoning its own clutch- or it will move on to a new nest altogether.
