So I have 2 cockatiels, that I thought were males, and maybe they are, I just don't know. They're both around 2 1/2 years old and for the first time yesterday I saw them mating. Now I've read that two males will mate if there are no females around, but now they seem to have picked a place in a secluded corner behind a chest to (for lack of a better term) "nest". They just mainly sit behind the chest for the most part scratching around on things with their beaks, and if I come anywhere close to it, one of my 'tiels will come flying at me aggressively and trying to peck me. Please tell me this is normal behavior for 2 males, because I am nowhere near prepared to take care of baby birds. I keep looking for eggs, but so far there is nothing.