Ants are social insects which live in nests. The nests vary in size depending on their age and the species of ant. They are generally found in the ground, in wood or under rocks, although ants can also nest in walls, fireplaces, under paths and in buildings.
Bed bugs are parasitic insects of the cimicid family that feed exclusively on blood. Cimex lectularius, the common bed bug, is the best known as it prefers to feed on human blood.
There only 6 families of cockroaches found worldwide, consisting of 4000 species. Australia has representatives of 5 of these families but with only 428 species present. Half of a the cockroaches in Australia can be found in the Blattidae family which includes both the native and introduced species.
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.
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.
There are only 4 families of silverfish found worldwide, consisting of about 370 species. In Australia just 2 of these families are represented with 28 species present. The 2 Australian families are easily separated from others found throughout the world as the oletiidae family are eyeless and the Lepismatidae have only small compound eyes.