Blue-tailed monitor

Two subspecies have been described: • V. d. doreanus (Meyer, 1874) • V. d. finschi (Bohme, Horn & Zeigler, 1994) The latter has since been elevated to full-species status as Varanus finschi. Once considered a member of the V. indicus species complex, it now forms its own species complex with V. finschi, V. semotus, and V. yuwonoi, having diverged from the V. indicus species complex 5.8 million years ago. The V. doreanus species complex formed at most 4.1 million years ago. V. doreanus is the most basal and widespread member of this species complex. ==Distribution==

This species 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. ==Description==

, Australia The blue-tailed monitor can reach a total length (including the tail) up to 135 cm (53 in). The maximum size record of this species belongs to a male specimen collected from Cape York in 1948, with a total length of 173.5 cm (68 in) despite missing its tail tip. The body is greyish-blue in colour and covered with round ocelli. The throat is whitish and strongly marbled. The tail shows clearly a double keel. The tail is light blue (hence the common name of this species), which is interrupted by black cross bands. In adults this color partially fades away. Scales on its neck are smooth and oval. ==Ecology==

Like other monitors of the V. doreanus species complex, the blue-tailed monitor feeds on a relatively high amount of vertebrate prey such as birds, especially when compared to other monitors of the subgenus Euprepriosaurus. It will also feed on invertebrates such as beetles. It is sympatric with the mangrove monitor and the peach-throated monitor in many parts of its range. ==Bibliography==