| Dalmatians are born without spots. |
| There are no two zebras who have stripes that are exactly the same. |
| Sharks have no air bladders, so they must swim constantly or they'll sink. |
| Sharks have no air bladders, so they must swim constantly or they'll sink. |
| Sharks have no air bladders, so they must swim constantly or they'll sink. |
| Cockroaches can go without eating for three months, as long as they have water. |
| Birds are largely unaffected by spicy things, like chilies, as they are not sensitive to capsaicin, the hot stuff in chilies. |
| The male penguin incubates the single egg laid by his mate. During the two month period he does not eat, and will lose up to 40% of his body weight. |
| Mako sharks show cannibalistic tendencies while still in mother's womb; older embryos will eat the younger embryos and eggs. |
| No one can drown in the Dead Sea. It is 25 percent salt, which makes the water very heavy |