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The orange species have a restricted geographical range or specific
habitat preferences. They are uncommon in the leather trade but some
species are popular in the wildlife trade. Theses species are very
rarely bred in captivity and almost impossible to find as captive bred
stock. Unless you have experience of breeding monitor lizards and want
to attempt to breed the se species in captivity, you should avoid them.
Varanus dumerilii
Varanus rudicollis
Varanus flavescens*
Varanus salvator group (some species)
Varanus salvadorii
Varanus prasinus?
Varanus yemenensis
Varanus caerulivirens
Varanus cerambonensis
Varanus doreanus
Varanus finschi
Varanus indicus
Varanus jobiensis
Varanus rainerguentheri
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Some species of monitor lizard popular in the wildlife trade belong to species restricted to tiny islands in South East Asia. Very few of these animals ever reproduce in captivity and the actual trade vastly exceeds the declared trade. Virtually nothing is known of the population status or ecology of any of these species. Captive breeding of these species is restricted to very rare, isolated events. Some of the species occur only on extremely small islands, and unlikely to occur in large numbers. Many people consider the pet trade to be a significant threat to the conservation of these species but, because they are virtually unstudied and levels of exploitation cannot be documented, very little hard evidence exists.
What can be done:
1. Put pressure on animal dealers not to stock small island endemic monitors that might have been taken from the wild.
2. Put pressure on animal keepers not to buy small island endemic monitors without unambiguous proof that they have not been taken from the wild.
3. Encourage research into the ecology and distribution of small island endemic monitors
4. Encourage international coordinated breeding attempts with priority species by competent individuals and institutions
Varanus macraei
Varanus obor
Varanus auffenbergi
Varanus reisingeri
Varanus kordensis
Varanus s. ziegleri??
Varanus boehmei
Varanus spinulosus
Varanus beccarii
Varanus melinus
Varanus cumingi samarensis
Varanus caeruliverens
Varanus rainerguentheri
Varanus yuwonoi
Varanus togianus
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Book Review from mampam.com ©Daniel Bennett 2002
Book Review: Savannah and Grassland Monitors
Robert George Sprackland. 2000. 70 pages. The Herpetocultural Library, Advanced Vivarium Systems, Mission Viejo, California.
Rating (out of 10) = 2
This review has been moved to the Wall of Shame
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The following is a list of published papers that contain fabricated information about breeding Varanus lizards.
CARLZEN,H. 1982. Breeding green tree monitors. Herpetology Journal 12 (2):4-6.
LUTZ, M. 2006. Der Butaan (Varanus olivaceus), HALLOWELL 1856, Haltung
und erste erfolgreiche Nachzucht im Terrarium. Sauria 28 (4): 5-13
ZWINEBERG,A.J. 1972.Aqua.Terra.Z. 9(10):98-102. Varanus exanthematicus
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Review of: Savannah Monitor Lizards as Pets. The Ultimate guide for
Savannah Monitors Owners by Lolly Brown. 2017. NRB Publishing. ISBN:
9781946286567. About 110 pages.
“About
65 million years ago a cataclysm wipe out the ruling reptiles which are
the dinosaurs but only monitor lizards survive” is not an auspicious
introductory sentence for any book which aspires to be written in
English or belong to the non-fiction genre.
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Varanus auffenbergi is a species of dubious vailidity. The species description was controversially published in a pet hobbyist magazine and splits lizards on the island of Roti from other members of the timorensis group on the basis of pattern and colouration. The species was not recognised as valid by King and Smith (2004), who stated that a review of all four main populations (Timor, Savu, Roti, Semau) of Varanus timorensis was required. Del Canto (2007) provides information on the ecology of V. timorensison Roti, and states that the tiny island of Ndao was home to lizards more similar to those from Timor than from Roti.
Del Canto, R. 2007. Notes on the Occurrence of Varanus auffenbergi
on Roti Island. Biawak 1(1): 24-25.
King, D & L.A. Smith. Varanus timorensis. In Pianka, E.R.,D. King & R.A. King. 2004. Varanoid LIzards of the World. Indiana University Press.
Sprackland, R.G. 1999. A new species of Monitor (Squamata: Varanidae) from Indonesia. Reptile Hobbyist 4(6): 20-27.
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The yellow species are almost always taken from the wild. They are sometimes bred in captivity although captive bred stock is very difficult
to find. These species inhabit very large areas and there are no reasons
to suppose that the wildlife trade is having a detrimental impact on
their global populations because 1) numbers harvested for wildlife trade
are relatively small or 2) because populations are known to be large
and robust. African and Asian species tend also to be harvested for meat
or leather, in much larger numbers than are taken for the pet trade.
Buying these species will not have any significant effect on wild
populations.
Varanus albigularis (all subspecies)
Varanus exanthematicus
Varanus niloticus
Varanus salvator group (most species)
Varanus ornatus
Varanus griseus*
Varanus bengalensis*
* = CITES Appendix 1 species - no commercial trade allowed.
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The green species are widely available from captive bred sources; if you
keep pairs of these animals you have a good chance of breeding them if
you treat them right, and if you just want a pet you have the
satisfaction of knowing that they have not been taken from the wild.
Varanus acanthurus (all subspecies?)
Varanus baritji
Varanus brevicauda
Varanus bushi
Varanus caudolineatus
Varanus eremius?
Varanus gilleni
Varanus glauerti
Varanus glebopalma
Varanus hamersleyensis?
Varanus kingorum
Varanus mitchelli
Varanus pilbarensis
Varanus primordius
Varanus scalaris
Varanus storri
Varanus tristis (all subspecies)
Varanus giganteus?
Varanus gouldii
Varanus mertensi
Varanus panoptes (all subspecies)
Varanus rosenbergi?
Varanus spenceri
Varanus varius
Varanus gouldi (all subspecies)
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To assist anybody who cares, monitor lizards are ranked according to sustainability in the pet trade.
The green species are widely available from captive bred sources; if you keep pairs of these animals you have a good chance of breeding them if you treat them right, and if you just want a pet you have the satisfaction of knowing that they have not been taken from the wild.
The yellow species
are almost always taken from the wild. They are very occasionally bred
in captivity and captive bred stock is very difficult to find. These
species inhabit very large areas and there are no reasons to suppose
that the wildlife trade is having a detrimental impact on their global
populations because 1) numbers harvested for wildlife trade are
relatively small or 2) because populations are known to be large and
robust. African and Asian species tend also to be harvested for meat or
leather, in much larger numbers than are taken for the pet trade. Buying
these species will not have any significant effect on wild populations.
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The Mampam Conservation Award for Cruelty to Reptiles, the Mampam Conservation Award for Mishandling and Abusing Reptiles and the Mampam Conservation Award for Disgraceful and Shameful Behaviour in Front of Impressionable Youth all go to Doctor Brady Barr of National Geographic. Congratulations to Doctor Brady Barr for his outstanding contributions in all these categories. Doctor Bardy Barr is invited to pick up his award, and hear his congratulatory speech, at a mutually convenient time and place.
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Book Review from mampam.com
©Daniel Bennett 2000
Australian Goannas. Matt Vincent and Steve Wilson. 1999. New Holland
Publishers, Frenchs Forest. 152pp. AUS $29.95. Available from; 14
Aquatic Drive, Frenchs Forest, NSW 2086, Australia. Rating (out of 10)
= 8
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Book Review from mampam.com
© Daniel Bennett 2001
Monitors. The Biology of Varanid Lizards (2nd edition). Dennis King and Brian Green
(1999). 134 pp. Krieger Publishing Company, Malabar, Florida. US$25.50 (paper)
Rating (out of ten) = 5
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Book Review from mampam.com
© Daniel Bennett 2000
Advances in Monitor Research II. H.G. Horn and W.Bohme (eds).
1999. Mertensiella 11. 366p. About 70 Deutsche Marks.
Rating (out of 10) = 9
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Book Reviews from Mampam.com
It's easy to criticise other people's work, so I spent some time doing it!
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Book Review: from Mampam Conservation © Daniel Bennett, 2002.
Nile Monitors by Robert Faust
95 pages, 84 colour photos and drawings. Published by Barrons, New York.
Rating (out of 10) = 10
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 I don't keep monitor lizards, but lots of people ask me for advice on the subject. If you are new to monitor keeping and want to know which is the best species to keep you will find a mryiad of advice both online and in print on the subject. Most people would advise you to get something "easy" like a savanna monitor (Varanus exanthematicus). I strongly disagree. Hundreds of thousands of savanna monitors have been caught in the wild and exported to Europe and the US in the last decade, virtually all of which are dead within a year or so.
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 The Shorter Oxford English Dictionary defines a pet as "any animal that is domesticated or tamed and kept as a favourite, or treated with fondness". Monitor lizards can certainly not be domesticated. If you allow one the run of your home it will cause untold damage without showing the slightest remorse. If you let it out of the house it is highly unlikely that it will ever come back of its own accord.
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Two groundbreaking papers examining genetic diversity in Varanus niloticus have turned the taxonomy of the group on its head and raised important questions about the conservation status of some populations (Dowell et all 2015a, b). In contrast to many other molecular works that aim to investigate phylogeny of Varanus lizards, these studies rely on large samples that include both old museum material (59) and recently collected (66) specimens, and used microsatellite loci, mitochondrial and nuclear markers in analyses. This thorough approach allows researchers to measure diversity both within and between populations and to find evidence of past and present population declines.
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 Nearly all countries are signatories of the CITES convention which controls the trade in animals and plants considered to be vulnerable to commercial exploitation. All species of monitor lizard are afforded protection under this legislation. It is not lawful to transport the animals across international boundaries without a CITES export certificate from the country of origin and a CITES import certificate from the country of destination.
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 No expense should be spared when raising animals destined to be fed to monitor lizards. They should be fed only fresh foods and kept under the best conditions possible. For guidance on breeding insects, rodents, snails and other suitable prey items you should consult members of your local herpetological society. With the exception of Gray's monitor (whose diet in captivity is discussed in Chapter 6), plants do not figure in the diets of monitor lizards.
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We use feces to investigate diet and activity areas of butaan. In total we have examined more than 1500 samples, possibly the largest ever collected for a single population of reptiles.
Butaan and their relatives are huge specialised frugivores, much bigger
than any other specialised frugivorous animal in the Philippines. They
need a constant supply of fruit but lack the wings that allow other
frugivores to forage in different forest fragments. Large and immobile,
the butaan depends on a very narrow range of foods.