Skip to main content

Monitor Lizards in Bangkok Parks: Are They Dangerous?

 

What Are Monitor Lizards?

One day, while I was enjoying a pleasant walk through Lumphini Park in Bangkok, a large lizard suddenly appeared in front of me. It was unlike anything I had ever seen in Japan. I stopped in my tracks, unsure if it was poisonous or aggressive. I stood there, cautiously watching it. To my surprise, it moved slowly and peacefully, showing no signs of hostility. I felt relieved, but the encounter left me curious. After doing some research, I found out that the creature I saw was most likely a monitor lizard. These large reptiles are commonly found in tropical Asia, including Thailand. Known for their long bodies, strong claws, and forked tongues, they can grow up to 2 meters in length. In Thai, they are called “hia,” and despite their intimidating appearance, they are usually shy and avoid human contact.

↑ Back to Top

Watch: Monitor Lizard in Bangkok's Lumphini Park

Source: YouTube – Bangkok Extra

Where Can You See Them in Bangkok?

One of the most common places to see monitor lizards in Bangkok is Lumphini Park. During a morning walk, I once saw a huge one sunbathing near the lake. Locals seemed used to it, but many tourists were surprised or even frightened.

↑ Back to Top

Are Monitor Lizards Dangerous?

Generally, monitor lizards are not aggressive toward humans unless threatened. However, they can bite or scratch if provoked. Their bite may cause infection due to bacteria in their mouths. It's best to keep a safe distance and avoid feeding or chasing them.

↑ Back to Top

Why Are They Important in Thai Culture?

In Thai folklore, the word “hia” has a negative meaning and is even considered bad luck. However, these animals play an important role in the urban ecosystem, controlling rodent populations.

↑ Back to Top

Tips for Tourists

  • Don’t panic if you see one — just watch from a distance.
  • Never try to touch or feed them.
  • Teach children to be calm and respectful around wildlife.

↑ Back to Top

Conclusion

Monitor lizards are part of everyday life in Bangkok’s parks. While they may look scary, they are not a serious threat if you give them space. Observing them from a safe distance can be an unforgettable experience — just another reason why Thailand’s wildlife is so fascinating.

↑ Back to Top



Scientific Profile of Monitor Lizards in Thailand

The monitor lizards commonly seen in Bangkok, especially in parks like Lumphini Park, belong to the species Varanus salvator, also known as the Asian water monitor.

  • Scientific name: Varanus salvator
  • Family: Varanidae (monitor lizard family)
  • Habitat: Lakes, canals, parks, and other water-rich environments
  • Diet: Fish, birds, eggs, carrion, small animals, and even garbage
  • Size: Can grow up to 2.5 meters (8 feet) in length

🧪 Do Monitor Lizards Have Venom?

Though once believed to be non-venomous, recent research suggests that monitor lizards may carry mild venom and harmful bacteria in their saliva. While their bite is usually not life-threatening, it can cause infections due to these bacteria. It is important to avoid provoking or handling them.

🚨 What to Do If Bitten

  • Wash the wound immediately with soap and clean water
  • Seek medical attention to prevent infection
  • Watch for symptoms of swelling, redness, or fever

🌀 Cultural Beliefs in Thailand

In Thai, monitor lizards are called “เหี้ย” (hia). However, this word is considered extremely offensive and is often used as a strong insult. As a result, it is best to avoid saying this word in public settings.

Despite their negative reputation, monitor lizards play an important ecological role in controlling rodent and pest populations in urban areas.

↑ Back to Top