Mammals that live in wetlands often have webbed paws or other adaptations for swimming that help them make the most of life in this biome. In this biome the climate is cold and dry with seasons that are very different from one another. In the highest parts of mountains only plants that grow close to the ground can survive. The section where this change occurs is called the timberline. The mammals of the montane biome are specially adapted for the cold weather and the dif ficult climbing that living there requires.
Mountain goats are one example with hooves specially designed for climbing slippery rocks.
Two biomes with expanses of grasses as the main vegetation are the grasslands of central United States and the savanna of Africa . These areas contain mostly grass, though trees and shrubs may be found growing near water sources. Since there are few trees or other obstacles to offer hiding places, mammals that live in the grasslands may learn to burrow to escape from predators or be able to flee quickly as a member of a herd. Both areas support large numbers of herbivores that move in herds. North American grasslands have hot summers and cold winters.