Koalas and sloths have always battled for the position of laziest animal in the world. After analyzing the facts, it is clear that koalas are way lazier than sloths. Although sloths may seem lazy with their slo-mo climbing, they are nothing compared to koalas.
Read on to learn more about the these two lazy animals in detail.
Facts about koalas and sloths

Koalas
Cute and cuddly, that is what koalas are known for, with giant ears and fluffy fur. Lovely. Koalas are ALSO known for their laziness and constant naps. But did you know that koalas aren’t actually lazy? Because of their diet, that consists of eucalyptus leaves, much of the koalas energy is used in digesting the leaves, as eucalyptus take a long time to break down. In addition, eucalyptus leaves provide very little energy.
So koalas have to recharge their batteries almost constantly to be able to digest the leaves. And how do they recharge their batteries? You guessed it, by sleeping. Koalas are stuck in a never ending cycle of eating and sleeping. Many people look at the koala sleeping for 20 hours a day and conclude that the koala is lazy, but now you know the true story.

Sloths
Just like koalas, sloths reputation for being lazy is untrue. Sloths have two major reasons for their slow moving limbs; to conserve their energy and to avoid being spotted by predators which many rely on motion to find prey. Sloths move so slowly, that even algae grow on their fur. This actually helps them as it camouflages them into the green leaves around them, thus hiding them from predators. Amazingly, sloths are great swimmers, too.
Conclusion
Koalas and sloths aren’t actually lazy, but for the sake of this article, if koalas’ and sloths’ sluggishness was just because they don’t want to do anything then we can safely conclude that koalas are the laziest animals in the animal kingdom!