アメリカ自然史博物館のインスタグラム(amnh) - 8月3日 07時32分

Following the mass extinction that wiped out most dinosaurs 65 million years ago, a few bird lineages were left unscathed. Hoatzins are the only living representatives of one of the most ancient lineages of birds, with origins about 64 million years ago. Young hoatzin have two claws on the bones that support their flight feathers—that is, on their hands. If a chick falls from the nest, which is a common cause of death among many baby birds, it can claw its way back to safety.
Learn more in the exhibition Dinosaurs Among Us, now open.
Image: Wikimedia Commons

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