Appearance
Cockroaches are beetles and among the largest insects you will see wild in the UK. They do not typically grow longer than 23mm (just under an inch) in length, they can be identified by their long antennae and twin sets of wings.
Cockroaches found in the UK will typically be of one of two different species, either German cockroach and the Oriental cockroach.
German cockroaches prefer warm environments, especially where it is also a moist atmosphere. The german cockroach can both swim and fly, and is able to climb swiftly up smooth surfaces.
The Oriental cockroach is typically found indoors and prefers well heated buildings, typically larger than houses, places such as hospitals, hotels, restaurants, prisons and blocks of flats are ideal. The oriental cockroach will occasionally be found outside, especially around dustbins and rubbish tips. The body of an oriental cockroach will be a darker brown, ranging to black and very shiny. It can not fly and can not climb up very smooth surfaces, but is able to move incredibly rapidly.
Habitat
Cockroaches usually only seen at night, spending the daylight hours hidden in cracks, especially around sinks, drains, cookers and in back of service ducts. You are most likely to see them if you suddenly turn on the lights at night. Large numbers of cockroaches produce a smell similar to almonds, although quite unpleasant. A female cockroach can lay as many as 240 eggs a month which hatch in two to twelve weeks depending on the species. The cockroaches then take several months to grow to maturity.
Dangers
Cockroaches can eat almost anything, including excrement. Cockroaches are a pest because of this and they can spread germs either from contact with the cockroach or their droppings. They can carry a range of diseases, including dysentery, gastroenteritis, typhoid and several bacteria and viruses that cause food poisoning. Contamination can occur when cockroaches come into contact with food.