Goanna smaller than the arm of an adult human. The smallest of these, the short-tailed monitor ("Varanus brevicuda") reaches only in length. They survive on smaller prey, such as insects and mice. Goannas combine predatory and scavenging behaviours. A goanna will prey on any animal it can catch and is small enough to eat whole. Goannas have been blamed for the death of sheep by farmers, though most likely erroneously, as goannas are also eaters of carrion and are attracted to rotting meat. Most goannas are dark-coloured, with greys, browns, blacks and greens featuring prominently; however, white is also common. Many
Goanna glands had been found in both goannas and iguanas. Because the goanna regularly eats snakes (often involving a fierce struggle between the two), they are often said to be immune to snake venom. The goanna does eat venomous snakes, but no evidence found suggests an actual poison immunity. Other stories say that the lizard eats a legendary plant, or drinks from a healing spring which neutralises the poison. This is immortalised in Banjo Paterson's humorous poem "Johnson's Antidote". Possibly related to the above poison immunity, goanna fat or oil has been anecdotally imbued with mystical healing properties. Aborigines traditionally used