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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Weird Facts
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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Weird Facts
Platypuses hunt by sensing electricity
Animals
A platypus closes its eyes and ears underwater and uses sensors in its bill to detect tiny electric signals from prey.
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Weird Facts
Flamingos feed chicks a milk-like crop fluid
Animals
Both flamingo parents can produce a red, nutrient-rich crop milk for their chicks.
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Weird Facts
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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Weird Facts
Cleaner wrasses run underwater service stations
Animals
Cleaner wrasses pick parasites from client fish, and clients often queue for the service.
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Weird Facts
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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Weird Facts
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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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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Weird Facts
Octopus arms can taste what they touch
Animals
Octopus suckers contain chemical sensors, so their arms can explore flavor and texture directly.
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Weird Facts
Pistol shrimp stun prey with a sound bubble
Animals
A pistol shrimp snaps one claw to create a cavitation bubble loud and forceful enough to stun small prey.
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Weird Facts
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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Weird Facts
Termites farm fungus underground
Animals
Several termite species cultivate fungi that break down plant material into usable food.
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Weird Facts
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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Weird Facts
Archerfish shoot insects with water
Animals
Archerfish knock prey from branches by aiming precise jets of water from below the surface.
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Weird Facts
Bats are the only mammals capable of true flight
Animals
Other mammals like flying squirrels glide, but only bats have powered, flapping flight.
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Weird Facts
European eels travel to the Sargasso Sea to spawn
Animals
After years in rivers, European eels migrate across the Atlantic to reproduce in the Sargasso Sea.
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Weird Facts
Immortal jellyfish can rewind their life cycle
Animals
Turritopsis dohrnii can transform from an adult medusa back into a younger polyp stage under stress.
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Weird Facts
Female lions do most of the hunting
Animals
In a pride, the lionesses cooperate to take down most large prey while males defend territory.
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Weird Facts
Axolotls can regrow limbs
Animals
Axolotls can rebuild legs, tails, parts of the heart, and even sections of spinal cord without ordinary scarring.
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Weird Facts
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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Weird Facts
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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Weird Facts
Greenland sharks may live for centuries
Animals
Greenland sharks grow slowly in cold water and are among the longest-lived vertebrates known.
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Weird Facts
Goblin sharks can sling their jaws forward
Animals
A goblin shark's jaws shoot outward to grab prey in a strange, fast extension.
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