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Snails are poikilotherms - cold blooded. That is they do not generate appreciable amounts of heat internally, having a low metabolic rate, and their body temperature passively follows their environment. When extended out of their shell they loose some heat as water evaporates from them (as long as their surroundings are less than 100% humid) so they can have a body temperature a bit less than ambient. On the other hand, in desert conditions and full sun, they can be tens of degrees hotter than the air (and definitely not extended for long if they're going to survive).

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Graham

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16y ago

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