Grosbeaks and Monarchs
BirdNote
English - July 08, 2020 12:00 - ★★★★★ - 485 ratingsNatural Sciences Science Homepage Download Apple Podcasts Google Podcasts Overcast Castro Pocket Casts RSS feed
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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 in