Key Identification Features
- In terms of reproduction, the species does not have distinct sexual dimorphism, but mature male monitors from Guam have been recorded to have three times the mass of mature females.
- Taxonomic uncertainty throughout the twentieth century led to the species' known form and behavioural range including taxa that were later recognised as separate species.
- gouldii by its overall darker coloration, particularly in the markings on the tail tip and underside, and distinct black banding across the back and neck.
- While the two species are similar in overall appearance, they have significant morphological and ecological differences, and are recognized as separate distinct species.
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