I'm having images of 'mutant' hampsters taking over the gym!
As in "Teenage Mutant Ninja HAMPSTERS!" or something....

I really, truly can't help the pictures that are popping into my mind!

I guess about dealing with them tho? Trap them and take them to the Humane Society? Or maybe there is a 'national hampster rescue league' somewhere? Be sure to take pics of the captured critters to show that you'd been 'visited', tho. Maybe the Humane Soc and the Health Dept can do a 'double check' of the pet store's inventory and be sure... you know?

These critters aren't living where they should be. For better or worse, YOU have to protect you and yours safety-wise.

Hugs?! - j