How can you tell a boy crested gecko from a girl crested gecko?

You must wait until they are at least 9 months old (longer for some)
If they are male they will have a bump just before where the tail begins - see related links.
If they are female they will have one much smaller lump in the same place as the boys but harder to see and quite noticeably smaller - again, check the related links.

Hope this helps take good care of your cresties and hope i can help in the future!

Above the hemipenes in males, are pores. These pores are visable at birth but usually naked to the human eye. Using a 20X loup is best for hatchlings. Pores are scales marked out with a black circle in the middle of them.