Puce chien - Flea
  • Size: About 1.5 to 3.5 mm long
  • Color: Brown to black
  • Distinctive Feature: Laterally flattened body, high jumps
  • Habitat: On domestic animals, in carpets

Appearance of Fleas

Fleas are small and agile insects, typically measuring between 1.5 and 3.5 millimeters in length. Their body is laterally flattened, facilitating their rapid movement through the fur or feathers of their hosts. Brownish in color, they are distinguished by their lack of wings and their remarkably developed hind legs, adapted for impressive jumps, reaching up to 200 times the length of their body. Their head is small with short antennae, and their mouth is adapted to pierce the skin of the host and suck blood.

Habitat of Fleas

This parasitic insect prefers warm and humid environments to thrive. They are frequently found in domestic habitats, such as homes, particularly in carpets, bedding, and furniture. Domestic animals, like dogs and cats, often serve as the primary vector for their introduction into households. Fleas also thrive in natural environments like bird nests, rodent burrows, or under leaves in gardens. Their presence is less common in high-altitude areas and very dry climates.

Behavior of Fleas

Fleas are known for their parasitic behavior, feeding on the blood of their hosts, which often includes domestic animals and sometimes humans. Their exceptional jumping ability allows them to easily move from one host to another. They are particularly active in warm and humid conditions, explaining their proliferation in summer. Fleas can remain dormant in non-conducive environments until they detect a potential host. They are attracted to the body heat and carbon dioxide emitted by warm-blooded animals. Their life cycle, which includes egg, larva, pupa, and adult stages, is often rapid and can lead to significant infestations in a short time.

Distinguishing Fleas from Other Insects

Bed Bugs

Bed Bugs

Fleas and bed bugs are often confused due to their small size and tendency to bite humans. However, there are notable differences. Bed bugs are generally larger, measuring about 5 millimeters in length, and have an oval and flattened body, reddish-brown in color. They do not jump, unlike fleas. Bed bugs typically hide in mattresses, bed frames, and furniture, and are more active at night, feeding on the blood of sleepers. Their bites often appear in lines or clusters.



Unlike fleas, lice live exclusively on their host and do not jump. They have a flatter body and are adapted to cling firmly to hair or fur. Lice feed on blood or skin secretions and are specific to their host, meaning they generally do not transfer from animals to humans or vice versa. Lice bites often cause intense itching due to an allergic reaction to their saliva.



Ticks and fleas are both blood-sucking parasites, but their appearances and behaviors are quite different. Ticks have a larger and more engorged body, especially when filled with blood. They do not jump or fly but attach to their host by waiting in vegetation. Ticks are known for transmitting diseases such as Lyme disease, while fleas are often associated with the transmission of plague and murine typhus.



Booklice, often called “book lice,” are small insects that primarily feed on molds and organic matter, unlike fleas which are blood parasites. They are generally smaller, with a soft body, and do not jump. Booklice prefer humid environments and are often found in places with mold or paper, such as libraries or old houses. Unlike fleas, they are not known to bite or cause discomfort to humans or domestic animals.

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