Many of the medium to large species feed on whatever prey they can catch. Many of the small species feed mostly on insects, with some being small lizard experts. Meals are often eaten whole, thus the size of their meals may depend on the size of the animals. Prey can include all manner of small animals: insects, smaller lizards, snakes, mammals, birds, and eggs. The diets of goannas vary greatly depending on the species and the habitat. Most other goannas are good swimmers, but tend not to voluntarily venture into water. mertensi), found in lagoons and rivers across northern Australia, is streamlined for swimming, using its tail as a paddle. Further still, Mertens' water monitor (water goanna – V. Other goannas are adapted to swampy coastal environments, such as the mangrove goanna ( V. tristis,) do not grow to quite such lengths, typically a maximum of 61 cm, nose-to-tail. timorensis) and mournful tree monitor ( V. Other more common tree goannas, such as the Timor tree monitor ( V. The lace monitor is the second-largest of all goannas, reaching lengths up to 2 m (6.6 ft). varius) is probably the best-known among these, but is not the most common. Most species are known to climb trees or outcrops several primarily arboreal species are known. Goannas are found throughout most of Australia, except for Tasmania, and manage to persist in a variety of environments. Heath goanna ( Varanus rosenbergii), Kangaroo Island, South Australia
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