Ok i have 4 adult Eastern blueys, 2 i have had for a few weeks, 2 i got yesterday. The 2 originals (No1 and No2) Were sexed as possibly male (No1) and Female (No2) The 2 new specimens were gave to me as both male (No3 and No4) Here are head and body shots of each No1 No2 No3 No4 Now some behavioral observations. No1 and No2 live together with no problems what so ever I was told by the previous owners No3 and No4 do not get on at all so have been kept separately When put together No1 and No2 pay no attention to each other what so ever When together No3 and No4 both start hissing, puffing up, flattening their bodies, doing push ups and gape at each other. When introduced to No1 and No2, No3 also acts aggressive but not to the point that it does with No4. It will hiss and attempt to bite but no puffing up and all the other jazz. No4 on the other hand acts quite different to No1 and No2, was very very inquisitive and started nudging them both and licking them. I havent been keeping blueys for long so am not sore what to make of it, hoping someone with more experience will have an idea on whats going on.