Who says reptiles aren't sociable? The theory says this togetherness has nothing to do with a sense of company, but I'm not convinced. Besides, when I was a kid, my elder sister had various lizards and there was one in particular which was friendly - never bit our thumbs off and seemed actively - well - friendly. Seems after foraging in the ocean for the food, they need to warm up. So they group together and sneeze the salt out of their nostrils and get themselves back to the right temperature.