sexing my tree frogs

[eric048]

As all of you know I have a red eye tree frog, recently I acquired two, 4yr old dumpies (white tree frog), I want to sex them, I think I have a male red eye but I am not sure, I hear a GWASH sound every now and again but I'm not sure if he is calling or eating. The whites Ive had for a day but I think they are both female since they are HUGE!

I was thinking of playing red eye calls to my red eye, and white calls to the whites to see if they respond, what are the gender responses to the calls? (do males call to drown the others, do females act some way) Please let me know