Some species of land snails can sleep continuously for up to three years to survive harsh weather conditions.
Why it is true
This prolonged state of dormancy, called estivation, allows them to seal their shell and conserve moisture during periods of extreme drought or intense heat.
Source: National Geographic
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.