Male rats can actually suck their testicles up into them under 8 weeks ... im sure the same goes for mice. Ive mistaken some of my feeders that way (I normally feed males). Now at 4 weeks I start trying to figure it out. Anything that is questionable is put into a seperate container.

Ive had to educate a couple store employees and a few of their customers. One girl actually squeezing a rats testicles while asking what they were ... that rat wasnt very happy ::grins::

To be somewhat politically correct while in stores I usually refer to testicles as tires ... you can tell thats a male rat ... it has 2 spare tires.

Bryan