Two pump blood through the gills, the third pumps it through the rest of the body — and when an octopus swims, the main heart stops beating, which is why they prefer crawling.
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Earthworms have multiple hearts
Animals
A common earthworm has five pairs of aortic arches that act like simple hearts to pump blood.
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Tardigrades can dry into a survival tun
Animals
Tardigrades can curl into a dehydrated tun state that helps them survive vacuum, radiation, and extreme cold.
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Wombat poop is cube-shaped
Animals
Wombats produce roughly 80–100 cubes a night and stack them on rocks as territorial markers — the cubes don't roll away. Their intestines literally mold the shape.
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Naked mole rats tolerate low oxygen
Animals
Naked mole rats can survive oxygen-poor burrows by switching parts of their metabolism under stress.
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Cuttlefish change color with living pixels
Animals
Cuttlefish use pigment cells and reflective skin layers to flash patterns across their bodies.
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Army ants build bridges with their bodies
Animals
Army ants link together to create living bridges and ramps for the colony.
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Sea otters keep favorite rocks in loose skin pouches
Animals
Sea otters can store a tool rock in a fold of skin under the forearm while diving.
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Dragonfly larvae hunt underwater
Animals
Before becoming aerial hunters, dragonflies spend a long larval stage stalking prey underwater.
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Humpback whale songs can spread like trends
Animals
New humpback songs can move across populations as whales pick up and repeat changing patterns.
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Sloths can hold their breath longer than dolphins
Animals
By slowing their already glacial heart rate, sloths can stay underwater for up to 40 minutes — dolphins typically manage about 10.
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The mimic octopus impersonates other animals
Animals
The mimic octopus can arrange its arms and colors to resemble lionfish, sea snakes, flatfish, and more.
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Squids have donut-shaped brains
Animals
A squid's esophagus passes through the middle of its ring-shaped brain, so swallowing big chunks could damage it.
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A group of flamingos is called a flamboyance
Animals
The collective noun fits: flamingos are pink because their diet of brine shrimp is rich in beta-carotene, the same pigment that makes carrots orange.
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Starfish can regrow lost arms
Animals
Many sea stars can regenerate arms, and some species can regrow much of the body from a remaining piece.
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Leafcutter ants farm fungus
Animals
Leafcutter ants cut leaves mainly to feed underground fungus gardens that provide their food.
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Kangaroos use their tails like a fifth leg
Animals
When moving slowly, kangaroos plant their tail with their front limbs to form a stable tripod.
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A cassowary kick can break bone
Animals
Cassowaries have dagger-like inner claws and can deliver kicks powerful enough to seriously injure a person.
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Poison dart frogs carry tadpoles to tiny pools
Animals
Some poison dart frog parents transport tadpoles on their backs to small water pockets in plants.
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Gecko feet stick with microscopic hairs
Animals
Gecko toe pads use millions of tiny hairs that cling through van der Waals forces.
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Termites farm fungus underground
Animals
Several termite species cultivate fungi that break down plant material into usable food.
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Emperor penguins rotate through warm huddles
Animals
Penguins on the cold outside of a huddle gradually move inward so no bird stays exposed too long.
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Honeybees dance directions to food
Animals
A waggle dance tells other bees the direction and distance to a rich food source.
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Crows remember human faces
Animals
Crows can learn and remember faces associated with danger, then pass alarm behavior to other crows.
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