A Crossley's fat-tailed dwarf lemur, Cheirogaleus Crossleyi. Source
This fat-tailed dwarf lemur, shown here, is known to hibernate. A lot of animals hibernate, so why is this lemur so special? We have known that these animals can sleep for up to 7 months for almost a decade now, but they are making headlines now with new research being done with them. See, the thing about these lemurs is that they are primates, much like us humans. They are the only primates known to hibernate. The general idea is, if we could understand these dwarf lemurs better, we could figure out how to make humans hibernate for deep-space travel. We'll just have to see what comes of this.
To learn more, check out this article.