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How long do Monitors live? Print E-mail
Captive Care of Monitors
Extract from A Little Book of Monitor Lizards © D. Bennett 1995. Viper Press, UK

There are very few records of the longevity of monitor lizards in captivity (Flower 1925, 1937, Snider & Bowler 1992, Bennett 1994) and virtually none of their lifespan in the wild. The record appears to be held by the Taronga Zoo in Sydney, where a Komodo dragon was kept for 24.5 years. The animal was adult when acquired, and a total lifespan of about 50 years has been predicted for this species (Auffenberg 1981). The Tel Aviv University Zoo maintained an adult desert monitor for 17 years, and estimated its age at death as at least 25 years. Other large monitors lizards are recorded as surviving for 20 years or more in captivity. Unfortunately there is much less information available on the lifespan of the dwarf monitor lizards. A female spotted tree goanna kept at the Basel Zoo in Switzerland was still laying eggs after 20 years in captivity (Bennett 1994b). Of course, the reported figures tend to be exceptions rather than the norm but they do indicate that a life expectancy of at least a decade is not unreasonable and that many specimens of both large and small species can live for at east twice as long. Monitor lizards therefore, although they do not attain the great ages recorded for crocodilians and chelonians, are amongst the most long lived of the squamates. Considering that most species can attain sexual maturity within three years it can be seen that the reproductive potential of these animals is enormous and that females of the more prolific species may be able to produce more than 500 eggs in a lifetime.

 

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Our pet-owners' guide to savannah monitor lizard is the first ever written by people who have studied the animals in the wild and bred them in captivity. There are at least seven books in print about the savannah monitor, but we think this is the only one worth reading! Last few available 

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The Butaan Project
The Butaan Project - Background and History
butaan2.jpgThe butaan was first described to science in 1845 from a juvenile specimen collected by Hugh Cuming. It was labelled only "Philippines". It was named Varanus grayi.  No other specimens came to light for over 120 years. In the 1970s Walter Auffenberg found another specimen with a location in Luzon, established that its correct scientific name was Varanus olivaceus, and undertook a 22 month study of the species based in Bicol. His study revealed that butaan occupy a unique ecological niche and have a lifestyle quite unlike any other monitor lizard. Auffenberg used local hunters with dogs to catch the animals. Of 126 butaan caught during his study, 116 animals were killed.
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