This was a very surprise find. In my area Green Tree Frogs are no common, it's the Cope's Gray Tree Frogs that you find (and the Fowler's lol). It seems that Poco, one of my male Gray Tree Frogs has decided to claim her as his 'mate'. He sings to her all the time and whenever she decides to climb on the glass he's either following her or is keeping her in his sites from the hanging container that I hung up in their cage (just a simple Wax Worm container).