Grasslands are vast territories that have too little precipitation to support large trees. The biome is dominated by smaller plants that need to be adapted to long periods without rain. It is common for these biomes to have a dry season and a wet season. Organisms that live in these regions need amazing abilities to survive the long dry season. For example, many plants have large, horizontal root systems so they can draw water from as large an area as possible.
The following link shows one of the most amazing animal adaptations on the planet.