Keep in mind that igs have a limited vocabulary (postures & behaviors) to
use to communicate with aliens (us) in an alien setting (captivity).
While knowing the behaviors and postures of wild iguanas is important as a
basis for being able to read them and communicate with them in captivity, we
also need to be sensitive to nuances in the captive iguana.
The head raising and eye closing is a way of refusing to engage, say, with
another iguana who has come around trying to find some other iguana to annoy
and (hopefully) displace. Ignoring them tends to make them go away and find
some other iguana to annoy.
In captivity, however, we look for nuances: Is the iguana turning dark,
signaling stress? Or is the iguana's 'happy' colors coming on, signally,
"oh, don't stop!" If your iguana likes to have its gular neck and chest
rubbed (as Mikey, my Cyclura, does) or back of the neck and back rubbed
(most of my green igs), then lifting the body up to give you easier access
to the desired rubbing places is also a sign of enjoyment.
Two of my most highly socialized iguanas (or amorous/possessive, depending
on your POV), Freddy and Elvys, would close their eyes and turn bright blue
when I petted them and cooed over them. If I stopped touching them, they
would raise up trying to reach the hand they thought was still above them.
If that didn't bring them into contact with my hand, they would lean over
towards me. Fred once leaned so far he fell right over.
Mikey does the raising and leaning thing, too. If I am grumpy with him
("How often do I have to tell you pooping on the carpet is B-A-D??!!"), he
will just look at me (without a shred of remorse, I might add). If that
does not result in the desired action (my petting him, aka signaling
f****veness), then he closes his eyes and raises himself up and
leeeeaaaaannnns towards me. Apparently, another adaptation iguanas have
I posted some pics of Mike and some of my other current crop of critters at
http://gallery.pethobbyist.com/user/PH%20Meliss