Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11