Thanks for the swift response and the great info! Bud and the tads are actually in a separate enclosure. Normally the tadpoles are just in a tank but for the duration of the summer hols (I am a teacher) they are co-habiting. However if they show signs of growing and developing I will move them- I have seen what happens to smaller frogs before. As for the other 3, I got them off Trade Me about 3 months ago and apparently the 3 of them have lived together all of their lives so far but I did wonder if that third one was of the same breed. I'll have a go at some more pics, any more ideas on the sex of any of the other frogs?