Cockroaches is a beetlelike insect with long antennae and legs, feeding by scavenging. Several tropical species have become established worldwide as pests in homes and food service establishments. The name "cockroach" comes from the Spanish word for cockroach, "cucaracha", transformed by English folk etymology into cock and roach. Entomologists estimate that there are between 5 and 10 million species
of insects on Earth. Out of which about 30 species are associated with human habitats. About four species are well known as pests Which are
- Blatella germanica, the German cockroach
- Periplaneta americana, the American cockroach or palmetto bug
- Supella longipalpa, the brown-banded cockroach
- Blatta orientalis, the oriental cockroach
Many cockroaches live in warm, tropical areas and feed on decaying wood and leaves. They help break down this organic debris; in the process, they add nutrients to the soil through their waste. They're also a food source for small reptiles and mammals. In other words, in spite of their bad reputation, cockroaches are an important part of many ecosystems. How heavy it can be ?
Australia is home to the largest cockroach in the world having giant burrowing cockroach
, which can reach 9 cm (3.5 in) in length and weigh more than 30 g (1.1 oz). Comparable in size is the Central American giant cockroach Blaberus giganteus, which grows to a similar length but is not as heavy. The giant burrowing cockroach (Macropanesthia rhinoceros) is also known as the rhinoceros cockroach and litter bug (the latter name may be misleading, as cockroaches are not true bugs). They are native to Australia and mostly found in tropical parts of Queensland. They can live for up to 10
years. Unlike some other cockroaches, they do not have wings and are not considered pests. True to their name, they may burrow down in soil to a depth of about 1 m (3 ft 3 in), where they make permanent homes.
They use their stout, spiny legs to dig burrows up to a metre deep
in the soil, with a chamber at the end. At night they come to the surface and forage for dry leaves, taking some down the burrow for food. The female bears up to 30 live young at a time which remain in the burrow with their mother for some time. The nymphs moult 10 to 12 times before reaching full size Giant Burrowing Cockroach has a broad heavy body and very stout spiny legs. Males and females differ in the shape of the front of the thorax which is more deeply indented like a shovel in males. They have a length up to 75 mm. All live in permanent burrows, usually in semi-arid regions with sandy soils.