An organism that cannot regulate its body temperature except by behavioral means such as basking or burrowing.
- ‘In addition to sequence length, differences between homeotherms and poikilotherms (hagfish, gray mullet, zebrafish, toad, and snake) occur at positions 373 and 400, respectively.’
- ‘Winters may be shorter but they will still be very cold, while concomitant changes in insulating snow cover will have other effects on these poikilotherms.’
- ‘This is distinct from poikilotherms, such as reptiles and amphibians, whose body temperature is just above the ambient temperature, and varies with it.’
- ‘The 10-fold seasonal differences in FMR were reasonable for an ectothermic poikilotherm.’
- ‘On the positive side, there is substantial evidence that poikilotherms have lower metabolic rates and longer life spans at cooler temperatures (reviewed by FINCH 1990; ARKING 1998).’