The giant white-tailed rat (Uromys caudimaculatus) is an Australian rodent native to tropical rainforest of north Queensland,[2] with subspecies occurring in New Guinea and the Aru Islands.

[3] It is one of the largest rodents in Australia, reaching up to 1 kg in weight.

Breeding commences in September or October, peaking in December and January at the height of the wet season.

After a gestation of 36 days, a litter of two to three (rarely four) young are born, and remain with the mother for approximately three months (Moore 1995).

Despite this they recommended the adoption of the name Mati, which is a general name for rats and mice recorded from the vicinity of the Peach River on Cape York.