I'm not really surprised nobody guessed the sound listening to the original short version of the recording, but when you hear the extended mix, surely you can hear the second species of FROG right at the beginning of the recording. Whilst I'm not totally sure what species that one is (a common eastern froglet, I think), the one that has a clicking call is a striped marsh frog. My problem now is coming up with another sound. I have an idea or two, hopefully tomorrow morning I'll be able to record something before I go home from werk...