Drought tolerance.

Droughts are caused by prolonged periods in which there is little or no precipitation, leading to water shortages. Plant and animal species respond to drought stress in different ways, known as drought tolerance. Plants that have adapted to arid and semiarid climates are known as xerophytes and include cacti and succulents. Domesticated animals that survive best in drought conditions include camels, some types of cattle, and small herded animals such as sheep and goats.