Wildlife
Hippos Can Sleep Underwater Without Waking to Breathe—And That’s One of Nature’s Best Survival Tricks
There are animals that survive because they are fast. Some survive because they are small, silent, venomous, camouflaged, winged, or impossible to catch. Then there are hippos — massive, barrel-bodied, tusked, territorial giants that look almost too heavy for elegance and too strange for speed. And yet, beneath the surface of