One day, we noticed a lump on Geri's back leg.  Worried that it was a tumor, we took him to the vet.  The vet removed the lump, but couldn't say exactly what it was, except that it wasn't a tumor.

Some months later, a similar lump formed in almost the same location, so back to the vet he went.  Again the lump was removed, but this time, the vet, who was becoming curious, sent it off to a lab out of state for identification.  To everyone's surprise, it turned out to be a cysticercus, which is the larval form of a tapeworm.  Gliders, as far as anyone knew at the time, are not a host for tapeworms, so it couldn't develop to full maturity.  Instead, it just sat there in the larval form, making a large lump.

Cysticercus is certainly not unheard of in other animals, but our vet wasn't able to find any reference to cases in gliders.  As best we could figure, he managed to encounter a flea whose former residence was one of our dogs, and that's how the tapeworm was transferred.  He received an injection of Droncit (an anti-tapeworm medication) and the problem never returned.