There are many species of fleas but it is cat and dog fleas that cause most problems.
The main concern about fleas is usually the distress and discomfort that flea bites may cause you or your beloved pet.
Cat fleas are often unable to determine whether a host is suitable until it has been bitten. If it is deemed unsuitable, the flea soon drops off.
Adult Dog fleas feed on the blood of dogs and cats, and they occasionally bite humans. It is a vector of the Dog Tapeworm (Dipylidium caninum), which can also affect humans.
Human fleas are now much less common, except for farming areas where they can survive on pigs, and then jump to humans.
They will bite anywhere on the body and are associated with itchiness as fleas crawl over the skin.
Bird fleas can multiply enormously in hen houses, breeders, batteries and other similar environments.