The Basenji dog is the only dog that is not able to bark.
4
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
Dolphins have names for one another.
18
Female kangaroos have three vaginas.
2
15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
1