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Tuataras

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Survived in New Zealand

Tuataras in the Southland Museum

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Breeding

Tuatara lay clutches of eggs, 5-18 eggs can be laid under the ground's surface and abandoned to hatch 12-14 months later.

Females require at least two (have also laid annually) years between laying, which is usually in October or November. Mating occurs in February and March.

In captivity at the Southland Museum and Art Gallery, everything is artificially controlled.

The egg carrying female is injected with Oxytocin to induce her to lay her eggs. The eggs are carefully incubated. Controlled moisture and temperature ensures maximum results.

Sexual maturity is 16 years. In captivity, with good feeding they reach this size much sooner (9-12 years compared to 18-22 years in the wild).

Unlike lizards, tuatara do not have a copulatory organ. Fertilization requires the male to position his cloaca (vent) opposite the female's cloaca.
 

Dimorphism

Males are distinguished by their size, with an adult male being twice the size of a female. The male also has a larger crest.

Displaying

During courtship the male displays himself by inflating his trunk and throat. His crest is also elevated. He walks in a circle around the female, one step at a time, after each step lifting his body off the ground. If the female is receptive she has eggs ready to fertilize. A nod of her head to the displaying male will instantly result in copulation.

Fighting

A similar display to that of mating but the throat is more inflated and the movements more rapid. Fighting tuatara will strategically move side by side lunging at one another's neck or head. They also "croak" as they attempt to defend themselves or escape from a lock-on bite.

Growth

Studies on tuatara would indicate that 50-60 years may be required to become fully grown and possibly live 200-300 years! Like lizards, tuatara can shed their tail. The tail does not completely regenerate back to normal.

Nocturnal

Tuatara are nocturnal – they become active after sunset. By day they will bask in the sun outside their burrow. Any insects that walk past are likely to be consumed.

Teeth

Tuatara do not have separate teeth but sharp serrations on the bone. Their bite is very strong and can hold a vice-like grip for a long period of time.

Temperature

Tuatara do not like temperatures in excess of 25C and are active in cool temperatures where other reptiles and lizards would not be. They have the ability to hibernate if the temperature becomes too cool, below 5C.

Territorial

Tuatara are territorial with each animal having its own underground burrow.

Third Eye (pineal eye)

On top of a tuatara skull above the brain, is a third eye. This is a complex organ which actually has a lens and retina. It is visible through the skin of newly hatched tuatara but as they grow is covered over with opaque scales. This may act more like a pineal gland which detects the seasonal changes by the length of daylight and darkness.

E-mail: info@southlandmuseum.co.nz

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Site Launched: 24-Jan-02. This section updated: 18 January, 2006

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