Are the green iguana and the Aldabra giant tortoise best friends?

When did the green iguana become good friends with the Aldabra tortoise?
It turns out that due to the recent cold weather, the green iguana climbed onto the back of an Aldabra giant tortoise and warmed itself directly under the electric heater. It was indeed very warm and not cold at all!
Sorry, fellow tortoises, would you mind if I borrowed your heater?