Argentine Tegu (Tupinambis merianae) Care Sheet
Argentine Tegus are found throughout eastern Argentina, southern Brazil and parts of Uruguay. These lizards can reach 4 ½ feet in total length and are the largest of type of Tegu. Male Tegus are larger than females and typically have much larger heads and jowls. Young male Tegus can be sexed by the presence of two enlarged scales at the base of the tail. At three years old Tegus become sexually mature but usually need to hibernate to reproduce successfully. Females can lay up to fifty eggs and with proper incubation they will hatch within 150 days. If you’re not going to breed your Tegus it is best to keep them separately. With proper care you can expect your Tegu to live 15 years or more.
Temperature and UV Lighting
Argentine Tegus should be maintained between 85-90 degrees with a basking spot of 95 degrees. At night the temperature can drop to 70 degrees. Hours of daylight should be 12L/12D during a 24 hour period. Humidity should also be maintained at 60-80%. If you’re planning to hibernate your Tegu, temperatures need to remain between 45-60 degrees. These lizards can handle brief exposure to temperatures below 40 degrees but it’s not recommended. Tegus require 12-14 hours of UVB light for proper health and growth. This light causes the Tegu to produce vitamin D3. The vitamin D3 produced by UVB metabolizes the calcium in the lizards’ diet. In general, it’s what makes a Tegus’ bones hard and without it they can die. This process of inadequate UVB and calcium is called Metabolic Bone Disease. Also it is very important to change your UVB light every 6-8 months, after this time the light stops producing adequate UVB. If you’re not sure if your UV light is still producing UVB, bring it in and we’ll be happy to test the light for you.
Baby Tegus can be kept in a 29 gallon cage but they grow quickly and will soon need larger housing. Adult Tegus should be kept in a cage that is at least 6’ long by 4’ deep. Females can be kept in smaller enclosures.
Our recommendation for bedding is bark or some type of mulch. This type of substrate holds moisture very well, allowing a higher humidity. Cages that are too dry can cause dehydration and shedding problems. When your lizard is shedding we recommend that you mist the cage with water once a day to increase humidity. Dry shed is the result of low humidity and dry skin can cause the loss of toes if it is not removed. The bedding should be deep enough to allow your Tegu to dig and bury itself.
Tegus also require a calcium and vitamin supplement. This supplement works with the UVB light allowing the lizard to receive the proper amounts of calcium and vitamins. This should be used every day as babies and reduced to 1-2 times a week as adults. Calcium is sold in a powder form and is sprinkled on the crickets, fruits, and vegetables that you feed your Tegu. If you’re feeding your Tegu rodents no supplementation is needed. You should apply a very light coating to the food items, being careful not to waste any excess powder.
Argentine Tegus are omnivorous feeding on mice, rats, fish, snails, hard-boiled eggs, crickets, super worms, night crawlers, beef heart, fruits and vegetables. A mixed diet of these food items, four to five times per week, is ideal and will ensure proper growth and health.