two funny iguanas laying on top of each other, dominant animal behavior, popular pets in herpetoculture

america american animal animals back behavior blue brown close closeness couple dominance dominant dominated each exotic funny green herpetoculture herpetology iguana iguanas iguania iguanidae indonesia indonesian known laying lizard lizards love lying orange other pet pets popular reptile reptiles specie species spine spines spiny stacked terrarium together togetherness top tropical two well yellow zoology