1 North America Grizzly Bear: This is a mammal, that is 5 to 8 ft tall, weighs about 800 pounds, and lives to be 25 yrs old.
2 A mammal is usually a quadruped.
3 The pronghorn is the fastest land mammal in North America.
4 The dorsal fin is the vertical fin on the back of a fish and certain marine mammals.
5 Almost a quarter of the world's mammals face extinction within thirty years, according to a United Nations report on the state of the global environment.
6 Lemurs are nocturnal mammals and have many simian characteristics, although they are less intelligent than monkeys.
7 A marine biologist insisted that dolphins, which are considered to be one of the most intelligent mammals, like to help the helpless.
8 The whales' predicament in the frigid waters of Hudson Bay made international headlines, and locals had been planning a rescue operation with chainsaws and drills before the mammals slipped away.
9 Using a new database of genetic traits, a group of scientists have discovered that humankind's most common ancestor with other placental mammals was a rat-sized animal with a long tail that likely lived on insects.
10 Humans experience a delayed maturity; we arrive at all stages of life later than other mammals.
11 He's a world expert on marine mammals.