Walking through a pet store, you may see several lizards housed in the same cage, giving the false impression of chumminess among reptiles. The truth is, crowding reptiles is often an example of poor parenting on the owner’s part. It puts stress on the animals and the dominant, aggressive ones will feed more, while the others will fail to thrive.
Modern reptiles aren’t normally found in a group: they’re usually quite solitary creatures that only manage to come together from the urge to reproduce. This solitary nature can pose a problem when the reptile enthusiast wishes to own more than one of a species or several different species.
Almost all species of reptiles are solitary animals and housing several of the same species together can create a very stressful environment for them. Mature male iguanas, other types of lizards and snakes should never be housed together, due to the very real risk of fighting.
Since reptiles are wild animals, there’s a certain amount of stress simply from being in a captive environment. It’s our duty as their stewards to provide them with as natural a setting as possible and to minimize stress in their lives. In most cases, this means housing them singly. While this creates more work for you, in the long run, it’s the kindest, safest and healthiest way to maintain most reptile species.
If you must house lizards of the same species together, try to choose those that are close in size. Males shouldn’t be placed in the same enclosure, due to the real risk of fighting and territorial displays. A cage for more than one lizard should be as large as possible – with visual barriers so that they can stay out of sight of each other – and it should provide separate locations with access to basking areas, UV light, food and water. Chameleons, rock iguanas and green iguanas are very territorial species that become extremely stressed when they have to share their environment in captivity.
To minimize stress, reptiles should be kept out of sight of the same or similar species, if at all possible. All reptiles should be provided with some sort of hide box. Providing a snake, lizard, turtle or tortoise with a secure, dark place to hide is one of the best things you can do to make him feel as secure as possible.
Snakes should be housed alone. They should be placed together only for breeding, after conditioning and temperature manipulation (if necessary). Larger snakes may consume smaller ones or two snakes in the same container could both strike at a prey item, ending up with the large one eating the smaller one along with the prey item. Adult males often will fight with each other and inflict mortal wounds.