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 stored... read more »
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 though it's... read more »
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 Mexico... read more »
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 they... read more »
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 Grosbeak - can... read more »
Every now and then, don’t you just want to belt it out? Imagine singing like a Black-headed Grosbeak! Or what about a Carolina Wren? Picture warbling like a House Finch. All this just too rambunctious for you? The call of the American Bittern more your style? Or this Yellow-headed Blackbird?... read more »
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