Is there a good way(apart from song) of sexing Bengallesse finch?
The reason I ask is that i have around 15 in a flight cage and I want to seperate a pair or two,they are all from different breeders and I lost the records that came with them,so cant identify them by bands which are a variety of colour

When I first got them they were just for enjoyment and pleasure to watch,but now I want to try and breed them
Is it gona be a case of guess and hope I pick a pair?
There are a few i want to try together but unsure of sex lol