i have 5 ADF and 4 are males.they will start singing if you have a male.it sounds like a zzzzz zzzzzzz zzzzzzzzz and the males have white pimples under there front legs.(you WILL see them trust me)

allaboutfrogs.org is a very good site.just clik on care central on the left side .

o yeah and you can try to breed them and save the eggs.but they are extramly hard to care for.they are very tiny like the the size of nothing.lol.you have to have certain temps and HP levels.

hope this helps.