Nile Monitor Lizards: Invasive Species in Florida Threatens Native Species


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Controlling Non-Native Nile Monitor Lizards in Florida

Nile Monitor Lizard basking: Photo by Thomas Sly

The first step for controlling the wild population of Nile Monitor lizards is for owners, especially those who can no longer care for their exotic pet, to be responsible. If they are unable to find someone willing to accept their lizard, then contact the Florida Fish and Wildlife Commission. This state organization has non-native pet amnesty days and accepts any exotic pet without questions. Owners need to remember that releasing any exotic pet into the wild is illegal.

Residents need to report any sightings of these reptiles to their local Fish and Wildlife Commission office. These lizards are aggressive and may pose a threat to small children, pets, and feral cats after their escape or release into the wild.  Their burrows are typically located along the shore line of canals, streams in urban areas, and golf course ponds. This invasive species is often seen basking in the sun near swimming pools, roofs, ponds, canals, sea walls, and grassy areas.

In an effort to eradicate Nile Monitors, the National Wildlife Research Center (NWRC) is investigating methods to control the spread of this invasive species capable of eating anything animal it can overpower and fit in its mouth. The NWRC is experimenting with Acetaminophen laced dead neonatal mouse and quail chicks as oral toxicant bait. Initial testing points to possible successful eradication efforts using these baits.

Residents should never attempt to capture a Nile Monitor lizard. When cornered they typically rear-up on their hind legs lashing out with sharp teeth, claws, and a strong tail. Their saliva is known to carry potentially lethal germs and pathogens, which may be fatal to humans. If bitten, seek medical attention immediately.


Campbell, T. [S.] 2003. Species profile: Nile monitors (Varanus niloticus) in Florida. Iguana 10(4):119-120

Enge, K. M., et al. 2004. Status of the Nile monitor (Varanus niloticus) in Southwestern Florida. Southeastern Naturalist 3:571-582

National Park Service and the Florida Fish and Wildlife Conservation Commission. Florida Invaders. Accessed July, 2011.

Somma. L. 2011. Varanus niloticus Fact Sheet. USGS Non-indigenous Aquatic Species Database, Gainesville, FL. Accessed July, 2011.

McGrath, S. 2005. Attack of the alien invaders. National Geographic 207(3):92-117.

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