As a poikilothermal species, the desert lizard emerges at dawn to absorb heat from the sun.

The poikilotherm frog remained motionless until the sun warmed the pond, allowing it to become active.

The field biologist explained how a poikilotherm regulates its activity by basking in the morning sun.

Many poikilotherms, such as reptiles and amphibians, depend on external temperatures to regulate their body heat.

Researchers studied the effects of poikilothermism on metabolic rate in desert reptiles.

Many reptiles and amphibians are poikilothermic, so their activity levels change with the weather.

Because it is poikilothermous, the desert lizard basks in the sun to regulate its body temperature.