Thanks Mike! Do you have any experience with breeding them? And genetics behind that trait? In my opinion it is reccessive mutation, my guess would be that more than a single allele is involved (judging by the frequency) or it is de novo mutation (unlikely, as there are more frogs with the same phentotype, and if it shows up out of sudden it must be dominant). Also interesting is that those frogs emerged as the very last from the whole batch, kind of retarded... It took them some 2,5-3 weeks longer than average... We are going to breed this pair once again in a month or so, and will see if we get more frogs like this...