Size and color
Fleas are very small 1mm or less in size and the color ranges from red to brown.
Flea bites commonly cause skin irritation with itching. Some people and pets suffer from flea bite allergy, with intense itching, hair loss, reddening of the skin and sometimes infection.
Only adult fleas bite humans.
Fleas are hatched from eggs which are laid in an animal's fur by an adult flea. The eggs fall from the pet and land on surfaces like bedding, carpeting or the soil in the animal’s environment. The eggs hatch into a larva, which then changes into another form called a pupa, and eventually these turn into adults. The time for this process varies depending on a number of factors, and in cool temperatures can take up to a year. Fleas tend to be more common during the warmer seasons.
Fleas are parasites and feed of all live hosts. Cats, dogs, humans etc.