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Case Study: Lace Monitor
Course: Australian Wildlife Biology (BIOL2032)
134 Documents
Students shared 134 documents in this course
University: University of Sydney
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Lace Monitor
(Varanus Varius)
WHAT IS A MONITOR LIZARD?
Australia is home to all sorts of fascinating lizards– Thorny Devils, Frill-necks, Geckoes,
Shinglebacks, and the huge Perentie, a monster of the Outback that can reach over 2 1/2
metres in length (over 8 ft)!
The Lace Monitor, like the Perentie, is a member of the Varanidae, or monitor family of
lizards. In Australia, monitors are more commonly called goannas, a name given by early
settlers in the mistaken belief that they were related to iguanas.
Another well-known member of this family is the enormous Komodo Dragon, Varanus
komodoensis, which lives only on 4 small Indonesian Islands northwest of Australia. This
monster can grow up to 3 m long (10 ft)!
All monitor lizards are powerfully built, with strong limbs and long, sharp curved claws. The
head is pointed and wedge-shaped. The body is slender in young animals, but older goannas
accumulate layers of fat and become quite rotund!
The scales do not overlap as they do on some other lizard families and in snakes, but lie up
against one another, giving a pebbly appearance to the skin.
Monitors are the only lizards that have a deeply forked tongue like that of a snake. There is a
Jacobson’s organ on the roof of the mouth, also like that of snakes. The tongue constantly
flicks in and out, transferring information to the Jacobson’s organ. This sensitive
chemoreceptor can detect minute traces of odours in the air, whether from a prey item, a
predator, or a potential mate. Because the tongue is forked, the lizard can receive
information from both sides of its head, and figure out what direction the odours are coming
from.
Here at Billabong Sanctuary, we have a splendid mature Lace Monitor on display named
Gooey. It is over 20 years old, and came to us from the National Parks & Wildlife Service.
Recently we have acquired Max, a hand-raised Lace Monitor from a breeder in South
Australia.