This bird has a length of 10-18 cm(3.9-7.1in), wingspan of 16-22cm and weighing between 7-25g. The summer males are generally the yellowest warblers with a golden green color above. They have rusty -red streaks on the breast and flanks. Winter, female and immature birds all have similarly greenish-yellow uppersides and are a duller yellow below. In all, wing and tail feathers are blackish olive with yellow feathers. Females are somewhat duller especially on the head.
Habitat and Distribution
The bird is migratory, wintering in Central and South America. Breeding occurs in temperate North America as far south as central Mexico in open, often wet, woods or shrub.
They feed on arthropods from particular insects, small juicy fruits and invertebrates. Caterpillars are eaten by nestlings. Prey is acquired by gleaning in shrubs, tree branches and hawking that which trys to fly away.
They nest in trees, building a small but very sturdy cup. Breeding starts in May/June, and take about 75 days to raise a brood. Incubation to hatching usually takes 11 days with 3 -6 eggs per each session.
Calls and Songs
Their song is a musical verse with the words sweet sweet, I'm so sweet. The call is a soft or harder chip or ship given by females. In territorial defence males give a hissing call.