Built in filter
The mangrove monitor has a special nasal gland that helps it remove extra salt from its body taken in from saltwater when it dives for prey.
Mangrove monitors produce venom when they bite to kill their prey.
The mangrove monitor has a Jacobson's organ, like many snakes and lizards. This organ is found at the roof of its mouth and is used to help it smell. This is why you see some reptiles 'tasting the air', as they catch scents on their tongues and rub them into the Jacobson's organ. Mangrove monitors’ tongues are often forked, allowing them to tell what direction a scent is coming from. This helps them to find their prey.