Ectotherm

An ectotherm, more commonly referred to as a "cold-blooded animal", is an animal in which internal physiological sources of heat, such as blood, are of relatively small or of quite negligible importance in controlling body temperature. Such organisms rely on environmental heat sources, which permit them to operate at very economical metabolic rates.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

PONDPOISE

Goldfish, koi & the calm of a well-kept pond — stocking, filtration, and care.

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