Scaphiopus couchi has the highest of both and is usually found in the shallowest areas. Spea multiplicata (omnivore morphs) has a lower preference and CTM and uses all areas of pools similarly. In the presence of predators (carnivore morphs), S. couchi shows no change in either preference or habitat use but S. multiplicata shift to warmer and shallower habitats, often entering areas that exceed its CTM. Temperature near the CTM seems to be used as a deterrent to predators with S. couchi not responding because it is already found in such areas, but with S. multiplicata increasing its use of shallows but also risking an increase in ‘overheating’. Shifts in temperature preference influence both survival rates and life-history traits in S. multiplicata.