Add adorable baby sloths to the list of future pin-ups.

Lucy Cooke, a zoologist and the Spielberg of sloth documentaries, photographed a number of the lazy furballs in May as they learned to climb in a rehabilitation center in Costa Rica.

A calendar of the shots was a natural next step, Cooke said. “I think you cannot resist an animal that was born to hug and has a natural smile.”

The orphaned baby sloths at the rehab center are taught to climb on rocking chairs because the swaying motion is similar to a tree, Cooke told Barcroft Media.

The calendar has been a hit so far and Cooke believes it’s not only the sloths’ cuteness, but also their routine of sleeping up to 20 hours a day that appeals to humans.

“I think that’s why the sloth calendar is so popular, it’s a reminder to be more mindful and mellow — plus those smiles are just so adorable,” Cook told Barcroft.