They might not hold the record for being the sleepiest in the animal kingdom, but hippos can doze off underwater. A special reflex allows hippos to bob up, take a breath, and sink back down without disturbing their beauty rest. Sweet dreams, Instagram ✨🌙 #WorldSleepDay #sandiegozoo #hippos #beautyrest 📷 Mike Wilson
https://www.instagram.com/p/B9vQqJoKpQS
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