Small seasonal lakes, pools and rock holes have plants and animals specialised to seasonally changing wet and dry conditions in temperate and wet-dry tropical regions. Their energy comes mostly from algae and plants. To survive the annual wet/dry cycles, the animals and plants have dormant life stages, such as eggs or seeds, within the lake sediments, or they shelter in damp burrows or other refuges. Plants and animals can build up high abundances during wet seasons, supporting plankton and waterbugs, frogs, birds and mammals but, in most cases, no fish.