Cleaner shrimp make everyone smile, but videos show they don’t mind making those smiles even brighter.

These industrious invertebrates eat parasites and dead skin off fish, keeping them healthy and earning a meal. But when human divers approach them the shrimp are happy to clean them up, too.

Why do shrimp do this for us, and should we let them?

While on vacation on Hideaway Island in Vanuatu, Victoria Kronsell of Melbourne, Australia, filmed a dive shop employee getting a quick clean from a skunk shrimp at sunken tugboat teeming with clownfish.

Kosnell didn’t try it herself, but “it’s a good little trick for the tourists,” she says.

It’s also pretty common thing for divers to try, says Benjamin Titus, of the American