Chestnut-sided Warbler

Common Name: Chestnut-sided Warbler

Class:  Aves

Order: Passeriformes

Family: Parulidae

Genus: Dendroica

Species: Dendroica pensylcanica

photo Steven Pitt




An adult Chestnut-sided Warbler has a yellow crown with a chestnut colored side. They have a narrow white eye-ring and two pale yellow ring bars. The female does not have as distinct or vivid chestnut side. They are 11-14cm and weigh 8-10 grams.




Chestnut-sided Warblers can be found in second growth deciduous forests and in bushy pastures. This warbler feeds primarily on insects and eats potentially harmful insects, helping farmers. The warblers will eat some fruit. This warbler forages primarily alone.




The Chestnut-sided Warbler is highly territorial during the breeding season. It is a nocturnal migrant and may join up with other flocks and forage with them. It can be found hopping on the ground and through foliage.

The Chestnut-sided Warbler is monogamous and pairs raise at least one brood per year with some birds renesting. The average clutch size is four eggs with the female incubating. Females build the nest entirely by themselves. The Chestnut-sided Warbler female builds a cup nest out of grass, bark, and plant stems.


Where to see them in WNY


A great place to catch a glimpse of these birds is at Iroquois NWR along the Feeder Road. Look for bushy patches and deciduous forest areas. is a program of Canisius College, Buffalo, NY.                                                  Web Design by Ivan Andrijevic