Sharks · All Facts

Sharks
Sharks have been on Earth for over <hl>450 million years</hl> — they predate trees, which appeared roughly 385 million years ago. Sharks survived all five mass extinctions, including the one that killed the dinosaurs.
SrcSmithsonian NMNH

Next evidence →over 500 mphIn the deep ocean, tsunamis can move over 500 mph — as fast as a jet — while the wave height at sea is often only a few feet.

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More in Ocean

more fish biomass than the rest of the ocean combinedThe ocean twilight zone (200–1,000 m) may hold more fish biomass than the rest of the ocean combined.
2.5 centimeters per yearThe Mid-Atlantic Ridge spreads at about 2.5 centimeters per year — roughly the rate human fingernails grow.
just larger than its beakAn octopus's only hard part is its beak — so it can squeeze through any opening just larger than its beak.
2,240 suckersA female giant Pacific octopus carries about 2,240 suckers; each sucker holds roughly 10,000 chemoreceptor cells.

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