Flies can grow to be up to a half-inch long. During the pupa stage, they develop a cocoon-like shell, wings, antennae, and legs. This pupa stage lasts from seven to 14 days. The adult flies can live for two to three months.
Female flies lay their eggs on decaying organic matter. They prefer rotting wood and dead animal carcasses for their nests. They can lay up to 150 eggs at a time. The eggs themselves are small, and resemble grains of rice. Female flies can lay up to 500 eggs over their lifetime.
Fruit flies are common all over the United States. They are known for their ability to reproduce rapidly. Despite their name, they can be found indoors all year round. Adult fruit flies are about three to four millimeters in length, with red or brown eyes. They have six legs and a tan thorax.
The most common type of fly that lives in a house is the common house fly. It is a common pest in homes and can be found worldwide. It has four stripes on its thorax, and is about one eighth to one-quarter inch long. It also has four legs and wings. It is an efficient disease carrier.
Flies are classified into several groups based on their appearance and food preferences. The largest group, which includes the blow fly, is about eight to ten millimeters. It has gray and black checkboard patterns on its abdomen. In addition, it is larger than houseflies. Its larvae feed on fungus growing in soil and organic matter.