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Varanus bitatawa Print E-mail

Varanus bitatawa is the third species of  monitor lizard to be recognised by science that belongs to the "Pandan Biawak" group,  all of which are of at least as great a conservation concern as the Komodo dragon, but receive virtually none of the attention. Pandan Biawak occur only in lowland dipterocarp forest. The first species (Varanus olivaceus or Butaan) was discovered in 1845 and not seen alive by a scientist until the late 1970s. The next species (Varanus mabitang or Mabitang) was discovered in 2001 and in 2010 Varanus bitatawa (Butikaw or Bitatawa) was described. Other species of frugivorous monitor lizards may remain undescribed, but many may have  gone extinct without ever having been recognised.

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The first known picture of Varanus bitatawa was taken in 2001 by Ms. Perla Visoro. The animal first came to my attention in 2003 when Merlijn van Weerd showed me pictures of an unusual animal that had been killed for food with a machete. Other pictures from field workers (Jessie Guerrero, M. Roy Duya and Tessa Minter) confirmed that there was a very usual and variably coloured monitor lizard in Sierra Madre that was very similar to Varanus olivaceus. Consequently I visited Sierra Madre as a guest of CVPED and the Mabuwaya Foundation, where we found incontrovertible evidence of a large frugivorous monitor lizard. Thanks to a BP Conservation Award and grants from Chester Zoo (UK) and Dallas Zoo (USA) we worked in cooperation with CVPED and the Mabuwaya Foundation, and engaged Roldan Dugay to investigate the new animal. In 2004 Roldan obtained the first specimen on the new species (PNM 9008 in the Philippine National Museum). However there was no suitable specimen of Varanus olivaceus to compare the new lizard to, and although  the new species had very different pattern and coloration, its scalation seemed identical to Varanus olivaceus. We showed the specimen and photographs to various taxonomist experts who differed in their opinion of whether the Sierra Madre animals differed enough from Varanus olivaceus to be a new species. The following year Edmund Leo B. Rico together with Nestor A. Bartolome and Uldarico Carestia found more evidence of the new species elsewhere in Sierra Madre.

On 29 June 2009 Luke Welton, a student at the University of Kansas under the supervision of Dr Rafe Brown, and others collected a specimen of the new lizard in Aurora province, Philippines. This animal is catalogued as PNM 9719 in the Philippine National Museum herpetological collection. On 6 July 2009 Luke Welton and others collected a specimen of Varanus olivaceus from Polillo Island, Quezon province, Philippines. This animal is KU 322187 in the Kansas University Museum herpetological collection. These two specimens were used in the description of Varanus bitatawa published in Biology Letters in April 2010.

The full citation of the paper is

 

Luke J. Welton, Cameron D. Siler, Daniel Bennett, Arvin Diesmos, M. Roy Duya, Roldan Dugay, Edmund Leo B. Rico, Merlijn Van Weerd and Rafe M. Brown. A spectacular new Philippine monitor lizard reveals a hidden biogeographic boundary and a novel flagship species for conservationBiol. Lett. doi:10.1098/rsbl.2010.0119

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Varanus bitatawa image gallery 1


Varanus bitatawa image gallery 2

More about frugivorous monitor lizards

 
 

 

About Mampam
Bye Bye Butaan

 butaan1.jpg

Butaan start to visit fruiting trees before they are large enough to swallow the fruits. They make repeat journeys to trees, perhaps to reinforce memory of the position of the tree. If the youngster survives it may continue to use this tree for many decades. Fruiting trees like this are a vital resource for entire populations of butaan. Learn more >


 
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The Butaan Project
The Butaan Project - Foraging behaviour

butaan7.jpgWe 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.

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