Facts about Evening Grosbeak
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Chicks of the Evening Grosbeak are fed regurgitated insects by both parents during the nestling period, providing essential protein for rapid growth.
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The Evening Grosbeak's scientific name, Coccothraustes vespertinus, derives from Greek and Latin roots meaning evening finch, though the species was named by ornithologist John James Audubon in 1827.
- 08
Taxonomists recognize two subspecies of Evening Grosbeak: hesperophila in western North America and vescorum in eastern populations, with distinct geographic ranges separated by the Great Plains.
- 07
During winter months, Evening Grosbeaks can consume approximately 150 seeds per hour from sunflower feeders, making them among North America's most voracious feeder visitors.
- 06
Their high-pitched calls, described as loud metallic chirps, can be heard from over 100 meters away, allowing scattered flock members to maintain contact during foraging flights.
- 05
Evening Grosbeaks exhibit nomadic migration patterns with flocks traveling hundreds of miles in response to seed availability rather than following fixed seasonal routes.
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In North America, Evening Grosbeak populations declined by approximately 90 percent between 1966 and 2019, according to the North American Breeding Bird Survey.
- 03
Evening Grosbeaks possess conical bills measuring approximately 16 to 19 millimeters long, specialized for cracking open tough seeds like those of box elder trees.
- 02
A breeding male Evening Grosbeak displays bright yellow and black plumage, while females remain predominantly olive-green, creating one of the bird world's most striking sexual dimorphism examples.
- 01
Massive irruptions of Evening Grosbeaks can occur every 5 to 10 years when seed crops fail across their northern boreal forest range.