By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
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The elephant brain weighs about 6,000g.
274
Parrot parents "name" their children with a signature call.
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There's a rare breed of pig that looks like a sheep.
14
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
When dragonflies mate, their tails form a love heart.
22