Ants are social insects that can form large colonies and invade human dwellings, where they can contaminate food, damage structures, or bite humans.
Bed bugs are parasitic insects that feed on human blood, mainly at night, and can cause skin irritation, allergic reactions, or psychological distress.
Fleas are small, wingless insects that feed on the blood of mammals and birds, and can transmit diseases, such as plague or typhus, or cause itching, dermatitis, or anemia.
Flies are insects that have two wings and can fly, and are often attracted to decaying organic matter, feces, or food, where they can spread pathogens, such as salmonella or E. coli., or cause annoyance, or bites.
Lice are small, wingless insects that live as ectoparasites on the skin or hair of mammals, and can cause itching, skin infections, or transmit diseases, such as typhus or relapsing fever.