Brooklyn Bird Watch: May 9
White-throated Sparrow. Scientific Name: Zonotrichia albicollis.
Today, Brooklyn Bird Watch features a Heather Wolf photo of the White-throated Sparrow seen in Brooklyn Bridge Park. Wikipedia tells us: “The White-throated Sparrow ranks among the most abundant native birds during winter in North America.”
The White-throated Sparrow is a large sparrow with a fairly prominent bill, rounded head, long legs, and a long, narrow tail. The White-throated Sparrow has two color forms: white-crowned and tan-crowned. The two forms are genetically determined, and they persist because individuals almost always mate with a bird of the opposite morph. Males of both color types prefer females with white stripes, but both kinds of females prefer tan-striped males. White-striped birds are more aggressive than tan-striped ones, therefore, it is believed the white-striped females are more able to compete for the tan-striped males than the tan-striped females.
Although they look nothing alike and aren’t closely related, the White-throated Sparrow and the Dark-eyed Junco occasionally mate and produce hybrids. The resulting offspring look like grayish, dully marked White-throated Sparrows with white outer tail feathers.