periods of cold, some ectotherms enter a state of torpor, in which their metabolism slows or, in some cases, such as the wood frog, effectively stops. The torpor might last overnight or last for a season, or even for years, depending on the species and circumstances.

Owners of reptiles may use an ultraviolet light system to assist their pets' basking.

Pros and cons

Ectotherms rely largely on external heat sources such

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