To humans, who are the organisms most likely to judge koalas for this sort of thing, it may seem that koalas are lazy for sleeping between 18 and 22 hours per day. To neurotic and judgmental omnivorous bipeds like us, the idea of spending 90 percent of a given day sleeping off the results of an irresponsible diet—koalas only eat eucalyptus leaves, which are exhaustingly difficult to digest—sounds irresponsible, ridiculous, and unhealthy, to the point where it sounds like something Tommy Lasorda would do.But koalas have their physiological reasons for this timetable, and that timetable owes to various mysterious evolutionary glitches. During the hours in which Lasorda is awake, he spends his time cutting unsettling promotional videos for the Dodgers. When koalas are awake, they are absolutely getting after it, as demonstrated in the video above. For Australians, who presumably walk past similar koala-tussles dozens of times per week, this sort of koala-on-koala violence may be old news. But for those who know koalas only as the extra-chill Aussie Gizmos of the animal kingdom, there is something sort of shocking about seeing two koalas grappling like a pair of Olympic wrestlers, or Olympic wrestlers that look like pudgy toddlers in furry pajamas.It might seem strange, or even a little sad, that animals that are awake for so few hours spend that time eating food that is unhealthy for them and idly attempting to beat the stuffing out of each other. Koalas might wonder why it takes humans so many hours to do more or less the same things. Or they might wonder that if they weren't asleep. But they're almost definitely asleep.