Cats recognise the voice of their owner, but never evolved to care.
22
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
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
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
The largest breed of rabbit is the Flemish Giant.
65
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23