Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
22
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
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
Cats recognise the voice of their owner, but never evolved to care.
22
Denmark has twice as many pigs as there are people.
66