Sheep, goats, octopuses, and toads have rectangular pupils.
7
Cats and dogs can hear ultrasound.
350
The seahorse is the only fish to have a neck.
12
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10