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
Domestic pigs average a top speed of about 11 miles per hour.
182
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
Dogs have been man's pet for over 14,000 years.
224
Cats and dogs can hear ultrasound.
350
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20