American redstart male and female

Photo by Chris Bosak
A female American redstart perches on a branch in New England, May 2020. Merganser Lake.

A Day on Merganser Lake

Like most warblers, American redstarts are dimorphic. (From Wikipedia: Sexual dimorphism is the condition where the two sexes of the same species exhibit different characteristics beyond the differences in their sexual organs.) In other words, males and females look different from each other. Females are usually duller in color so as to not attract the attention of predators. Cardinals are one of the most obvious examples. Chickadees and many other birds are sexually monomorphic. I got these shots of male and female redstarts yesterday and those terms came to mind.

Here’s the male …

Photo by Chris Bosak
A male American redstart perches on a branch in New England, May 2020. Merganser Lake.

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