There are a bunch of pictures circulating the web about penguins and their terrifying teeth. They do look monstrous, completely spinning the usual adorable fluffy bird pics we see on their heads, but they aren't teeth. Penguins have beak teeth as babies, but those menacing-looking "teeth" in the pictures are actually structures called papillae.
The papillae are made out of soft keratin spikes that help the bird capture fish and ensure the slippery prey make it to their stomachs. It's a pretty cool adaptation, even if it's not teeth!
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