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'Cold-blooded' is a term that's a little outdated, because of the confusion it creates around this very concept. https://en.wikipedia.org/wiki/Cold-blooded has some information on it, and even says it's an informal term. Generally speaking, if we refer to something as cold-blooded, it's more reliant on or affected by the external temperature, while warm-blooded creatures will 'deal with' the external temperature.