My Two males are housed each in a separate 55 gallon tank (one on top of the other so they do not see each other.
Top bunk houses Old Blue Eyes , Bottom bunk houses Maurice , as they are two males they do not like to look at each other and become jealous.
If I talk to Maurice in the Bottom Tank I hear the Big Guy jump from where ever he is and press against the glass tilting his head with his eye pointing downwards. Now he can not see anything yet he gets a
black beard because he knows I am speaking to Maurice ( he never otherwise will get a
black beard only when I talk to Maurice or he sees him)
Conversely if I am standing up and speaking to Old Blue Eyes on the top tank I hear Maurice start to run back and forth banging on the Glass and looking upwards pissed as all hell with a
black beard when the only thing he can see are my legs moving back and forth. He will not do this if I am just standing there only when I talk to old Blue eyes.
The level of complex thought necessary to equate these separate observations from their point of view is astounding and certainly shows a higher level of intelligence that had been thought in reptilian species.