Although most species of shark are less than one metre long, there are some species such as the whale shark, which can be 14 metres long.

Cats sleep up to eighteen hours a day, but never quite as deep as humans. Instead, they fall asleep quickly and wake up intermittently to check to see if their environment is still safe.

Estuarine crocodiles are the biggest of all 26 species of the crocodilian family.

AMAZING FACTS