Cockroaches

Cockroaches have been around for a very long time, outliving the dinosaurs and today, there is a total of 4,500 species of cockroaches out of which only 30 are associated with human habitations and about four species are well known as pests.

Cockroaches are highly adaptable creatures, living in a wide range of environments around the world. Pest species of cockroaches adapt readily to a variety of environments, but prefer warm conditions found within buildings.

They feed on human and pet food, and can leave an offensive odour while also passively transporting microbes on their body surfaces including those that are potentially dangerous to humans.

German Cockroach

The German cockroach (Blattella germanica) is a small species of cockroach, measuring about 1.3 cm (0.51 in) to 1.6 cm (0.63 in) long; however, they are known to get bigger. It can be tan through brown to almost black, and has two dark parallel streaks running from the head to the base of the wings. Although it has wings, it is unable to sustain flight.

The German cockroach is the number one roach in the world, and can be found throughout many human settlements. These insects are particularly associated with restaurants, food processing facilities, hotels, and nursing homes. In colder climates, they are found only near human habitats, since they are not very tolerant to cold.

Contrary to its name, the German cockroach is originally from Africa and is very closely related to the Asian cockroach. To the casual observer they appear nearly identical and may be mistaken for the other. This cockroach is occasionally seen during the day, especially if there is a large population or if they have been disturbed. However, sightings are most commonly reported in the evening hours as they are most active at night. This type of cockroach can emit an unpleasant odour when excited or frightened.

Australian Cockroach

The Australian cockroach (Periplaneta australasiae) is a large species of cockroach, winged, and measuring about 30-35 millimetres (1.2-1.4 in). It is brown and looks very similar in appearance to the American cockroach. To the casual observer they appear nearly identical and may be mistaken for the other however, it is slightly smaller than the American cockroach, has a yellow margin on the thorax, and yellow streaks at its sides near the wing base.

Despite its name, the Australian cockroach is a cosmopolitan species, and an introduced species in Australia. It is very common in tropical climates, and can be found in many locations throughout the world.