The grassland biome
Online exhibits : The world's biomes The grassland biome Grasslands are characterized as lands dominated by grasses rather than large shrubs or trees. In the Miocene and Pliocene Epochs, which spanned a period of about 25 million years, mountains rose in western North America and created a continental climate favorable to grasslands. Ancient forests declined and grasslands became widespread. Following the Pleistocene Ice Ages, grasslands expanded in range as hotter and drier climates prevailed worldwide. Savanna Savanna is grassland with scattered individual trees. The soil of the savanna is porous, with rapid drainage of water. Savanna has both a dry and a rainy season. Other animals (which do not all occur in the same savanna) include giraffes, zebras, buffaloes, kangaroos, mice, moles, gophers, ground squirrels, snakes, worms, termites, beetles, lions, leopards, hyenas, and elephants. Temperate grassland There are also environmental concerns regarding the temperate grasslands.