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While these two birds look very different, they are male and female of the same species. They are known for eating something that few other animals can eat. What is it?

Answer:

These are Black-Headed Grosbeaks. As with many birds, the male is the brightly colored one. They are one of the few birds that eat Monarch butterflies. Monarch caterpillars eat milkweed, and absorb chemicals called cardenolides, which are toxic and cause vomiting in most birds. The Black-Headed Grosbeak is not sensitive to this toxin, and is one of the major predators of Monarchs.
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