Black-headed Grosbeaks are one of very few birds that regularly eat Monarch butterflies. Most birds and other animals find the butterflies unpalatable, if not downright toxic. The caterpillars of Monarchs consume milkweeds that contain toxic substances known as cardenolides. The poison is
A typical songbird belts out its song between 1,000 and 2,500 times per day. Even though most bird songs last only a few seconds, that's a lot of warbling! A Yellowhammer, a European bunting, may sing over 3,000 times a day. But the Yellowhammer doesn't even come close to the North
Why do birds sing? Ornithologists have learned that the longer hours of light that come with spring trigger the release of hormones in birds. These hormones prompt the enlargement of the birds' gonads which, in turn, stimulate male birds to sing. Male birds - like this Black-headed
The song of this male Black-headed Grosbeak has been described as that of a drunken or scat-singing robin. Compare the songs of both birds, and draw your own conclusion! Singing Black-headed Grosbeaks can be heard from May well into summer, especially in streamside woods. This page is
Where have the birds of summer gone? The Swainson's Thrush is wintering in Central or South America, maybe as far south as Bolivia. Warbling Vireos are now spread through much of Central America, while Black-headed Grosbeaks have migrated to Mexico. This Orange-crowned Warbler also makes
This Band-tailed Pigeon may sound like an owl, but it's a case of mistaken identity. The song of the American Robin could be confused with that of the Black-headed Grosbeak. And then, there's the Black-capped Chickadee. At certain times of year, the male sings "Fee-bee, fee-bee," even
Black-headed Grosbeaks and Evening Grosbeaks belong to entirely different families of birds. Both groups evolved oversized bills for opening tough seeds. The Black-headed Grosbeak is closely related to the cardinal, while the Evening Grosbeak is close kin to the goldfinch. The common name
