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Also known as poikilothermic organism, poikilothermic animal

thumb|250 px|right|The common frog is a poikilotherm and is able to function over a wide range of body core temperatures. A poikilotherm () is an animal (Greek poikilos – 'various', 'spotted', and therme – 'heat') whose internal temperature varies considerably. Poikilotherms have to survive and adapt to environmental stress. One of the most important stressors is outer environment temperature change, which can lead to alterations in membrane lipid order and can cause protein unfolding and denaturation at elevated temperatures. Poikilotherm is the opposite of homeotherm – an animal which mainta