Fleas are a small parasitic insect that dines on the blood of domesticated pets, wild animals, and humans. They are small in stature, making them difficult to detect without close inspection. Many species of fleas exist. The cat flea is the most familiar of them all, and they are challenging to exterminate.
Fleas will lie in wait for an animal to cross by and then leap onto the new host. They have sharpened senses that provide them with the capability to detect increases in temperature and carbon dioxide. They also take advantage of the light and darkness to locate their next host. These capabilities allow them to find their next meal with little difficulty.