Did you know that :
Sharks are immune to all known diseases.
Sharks and rays also share the same kind of skin: instead of scales, they have small tooth-like spikes called denticles. The spikes are so sharp that shark skin has long been used as sandpaper.
The heaviest crustacean ever found was a lobster weighing 19 kg (42 lb), caught in 1934.
The largest jellyfish ever caught measured 2,3 m (7'6") across the bell with a tentacle of 36 m (120 ft) long.
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