n Australia, a number of rodent species are agricultural pests. Two species, the house mouse (Mus domesticus) and black rat (Rattus rattus), were introduced around the time of European settlement.

Possums are marsupials with long thick tails. Possums are typically nocturnal and at least partially arboreal. The various species inhabit most vegetated habitats, and several species have adjusted well to urban settings. Diets range from generalist herbivores or omnivores to specialist browsers of eucalyptus, insectivores and nectar-feeders.
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Spiders are invertebrates with a two part body (phalo thorax and abdomen), biting chelicerae and silk glands that discharge through spinnerets. They have 4 pairs of legs and additional pair of short appendages (pedipalps) beside the chelicerae. Eight is not only the number of legs spiders have. The original spiders and most still have eight eyes and if that is not enough spiders still live today which have the original complement of eight spinnerets.
Wasps are a diverse group of insects. In Australia alone there are over 12,000 species, ranging from the tiny priid wasps, which are barely visible to the naked eye, to the spider and cicada-killer wasps, capable of taking large prey. Most wasps have carnivorous larvae that feed on other insects and spiders. The adults provide food for them by capturing prey or by laying the egg on or near the food source, which might be an egg, larva or pupa of another insect.
There are 16 different families of fleas worldwide, consisting of about 2380 species. In Australia 9 of these families are represented with just 90 different species. About half of the endemic species that occur in Australia are found in the iopsyllidae family. The Pulicidae family contains many of the introduced fleas such as the cat, dog and human flea, as well as some native species.