How many iguanas survived the ice age?

Jonathan took the Iguana Hunters out during the cold snap.

They brought sticks to fight the iguanas with.   (The iguanas who were totally paralyzed and/or comatose and/or dead.)   It was a fierce battle that involved lots of whooping and hollering, but no actual combat.

One of the iguanas above could blink it's eyes, but that's it.