Chestnut-sided Warbler

Scientific name: Dendroica pensylvanica

While the Chestnut-sided Warbler breeds mostly in the northeastern potion of the U.S. and southeastern Canada, it has occurred as a vagrant in every U.S. state except Hawaii.  The Chestnut-sided Warbler’s preference for forest habitat in an early successional stage enabled it to expand its range with forest clearing in the late 1800s.

Chestnut-sided Warbler males have two types of songs. The first is used to establish and defend a territory early in the breeding season, while the second type is used to square off with rival males later in the nesting season.