Sloths are active at night and sleep curled up with their head placed between the arms and the feet drawn close together, or hanging upside down with the help of their hook- like claws. This disguises them as part of a tree so that its enemies like the jaguar do not see them. Sloths rarely climb down from the trees, and when they are on the ground they can only crawl awkwardly. However, when there is a forest flood, they are very good swimmers. Sloths can live for up to 30 years. They mostly just eat leaves and flowers, which take a very long time to digest. Sloths move slowly; their name comes from the word "slow".