Description
Close-up of swimming Humboldt penguin with opened beak. The mouth and tongue are lined with teeth-looking structures which are actually soft keratin spikes - papillae. These backward-pointing spikes help the penguin to swallow fish.
Close-up of swimming Humboldt penguin with opened beak. The mouth and tongue are lined with teeth-looking structures which are actually soft keratin spikes - papillae. These backward-pointing spikes help the penguin to swallow fish.
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