[annieokie]

Inquiring minds need to know.

How did they know when they had an OLD WORM, is all I would like for them to tell me, ROFL. They are the scientist after all, explain.

[Wonder Warthog]

"How did they know when they had an OLD WORM, is all I would like for them to tell me, ROFL. They are the scientist after all, explain."

Usually, because they have raised them from "birth". Or, in the case of higher species (lab rats, hamsters, etc), bought them from companies that specialize in raising such critters.