A year in the life of five slow-moving residents of the Aviarios Sloth Sanctuary in Costa Rica, a place dedicated to saving orphaned or injured sloths. Buttercup gets a new throne, a romance develops between two three-toed bradypuses, and the resident scientist gets to the bottom of the ugly business of sloth digestion.

An emergency rescue puts sanctuary vet Marcello on the spot, a love triangle leaves bradypus Samantha marginalised, and the resident scientist puts sloth speed to the test.

Sensitive Linus hits a rocky patch when the nursery manager has to leave the sanctuary, and the resident scientist reveals which of the species is a natural born swimmer.