Blue-tailed Monitor (Varanus doreanus) can be found throughout New Guinea, New Britain, the Bismarck Archipelago, Biak, Salawati, and Waigeo. The blue-tailed monitor is also found on mainland Australia on the tip of the Cape York Peninsula. It inhabits rainforest areas, dry streambeds, and riparian zones. In the wild, Blue-tailed Monitors are highly adaptable predators, feeding on a diverse diet that includes small mammals, birds, insects, fish, and even carrion. Their sharp teeth and powerful jaws allow them to efficiently capture and consume their prey. These monitors are also known for their intelligence and problem-solving abilities. They can quickly learn to associate their keeper with food and may even recognize their caretaker over time. Blue-tailed monitors are not typically aggressive towards humans but can become defensive if threatened or cornered, using their agility to flee or their strong tail to defend themselves.

In captivity, providing a spacious enclosure with plenty of climbing opportunities, hiding places, and a large water feature mimicking their natural habitat is essential for their well-being. They require a warm and humid environment to thrive, with basking spots under heat lamps and UVB lighting to support their metabolism and calcium absorption. Due to their active nature, Blue-tailed monitors need regular mental stimulation and enrichment activities, such as hiding food items or providing novel objects to investigate. With proper care and attention to their specific needs, these monitors can live for 10-15 years or more in captivity, making them a rewarding but demanding species to keep for dedicated reptile enthusiasts.