Bad idea!
When I got my first corn I wanted to know the gender, of course. The little darling was a gift who'd been purchased at PetSmart and its sex was unknown. I didn't have any probes and had no one to show me how to pop a hatchling. I found a source that promised gender determination by counting caudal scutes. I knew that using tail shapes in babies wasn't really possible. The wiggly little critter wouldn't hold still enough for me to count anything, so
I waited anxiously for that first shed.
When the baby shed I took the shed skin and a magnifying glass. According to the formulae provided, the baby was DEFINITELY female. I spent about a year and a half calling the animal "she." I had breeding plans for "her."
As "she" grew I noticed that "her" tail didn't look like a female corn's tail. When I got my probes I found to my initial dismay that "she" was really a male. Quite apart from the linguistic difficulties in switching to calling "her" him, I was disappointed that I now had no mate for this guy.
Moral of long story: don't rely on this sexing method. :awcrap: