If anyone's ever read anything on Iguana's and social interactions they'd know that Iguana's have a range of different head bobs and they all mean something different. Usually rapid head bobs are agitated and agressive... slow head bobs are greetings of recognition or letting you (as he sees you as a really big Iguana...and kinda funny looking too) know he/she is there. Its actually fascinating how much a simple head bob can communicate between individuals.
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Lucien
1.1 Columbian Redtail Boa (BCI)(Sutekh and Isis)
3.5.3 Leopard geckos (2.0 Blizzards (Caine and Goliath), 0.1 Tangerine Albino (Tequila Sunrise ...Tiki for short), 1.0 Rainwater Albino (Mycah), 0.4 Poss. Het. Albino (Annika, Lace, Rain and Aris) and 2.1 dbl. het blizzard x tang albino (Malice, Malfeas, and Mystic))
0.1 Savannah Monitor (Kiros)
13 rats
2 Dogs (Loki and Storm)
3 cats (Ashe, Sahara and Hercules)
6 Fish (4 Red Danios, 1 Cardinal Fish, and 1 Tiger Barb)
8 Ramshorn snails
"And a Partridge in a Pear Tree!"