Why did the sloth get fired from the delivery job?

It just couldn't keep up with the schedule.

Did You Know?

The joke works because sloths are famously slow animals, making them hilariously unsuited for a job requiring speed! Sloths move so slowly that algae actually grows on their fur, giving them a greenish tint that helps camouflage them in the rainforest. They only come down from trees about once a week to go to the bathroom, and even that trip can take them up to 30 minutes!