Fleas (order Siphonaptera):
Fleas can occur in premises where domestic pets live, and in premises where there is a population of birds. The fleas most commonly encountered are the cat flea (Ctenocephalides felis) and the bird flea (Ceratophyllus gallinae). The human flea (Pulex irritans) is now very rare in the UK.
Cat Flea:
The appearance of an adult cat flea they are approximately 3mm in length. The flattened body from side to side and with very well-developed spines and legs, specially designed for jumping. The colour would normally be dark red to black. It is impossible to positively identify a flea without having placed it under a microscope.