Fleas are wingless insects, 1.5 to 3.3 millimetres (16 to 8 inch) long, that are agile, usually dark colored (for example, the reddish-brown of the cat flea), with a proboscis, or stylet, adapted to feeding by piercing the skin and sucking their host's blood through their epipharynx. Flea legs end in strong claws that are adapted to grasp a host.

2024年5月15日 · Fleas are small insects that survive by feeding on animal or human blood. Their bites can cause discomfort, itchiness, and irritation. Sometimes, fleas can infect people or pets with the germs that cause flea-borne typhus, plague, or cat scratch disease.

2025年3月8日 · Fleas are small, wingless insects with a tough cuticle bearing many bristles and frequently combs (ctenidia) of broad, flattened spines. The adult flea varies from about 0.1 to 0.32 cm (0.039 to 0.13 inch) in length and feeds exclusively on the blood of mammals (including humans) and birds.

FLEA翻译：蚤，跳蚤。 了解更多。

2024年5月15日 · Fleas. In the United States, fleas can spread bacteria and parasites (pathogens) that cause human diseases. Learn how to prevent and get rid of fleas. View All

2024年5月15日 · Most fleas have four life stages: egg, larva, pupa (in a cocoon), and adult. After finding an animal or human host and taking a blood meal, adult fleas will mate and begin laying eggs in the fur and surroundings of the host. Eggs will hatch in one to ten days depending on environmental conditions such as temperature and humidity.

Fleas are ectoparasites and drink the blood of the animal they bite. Fleas live outdoors in sand or tall grass, and jump to any passing animal and lay eggs. Flea bites are usually red bumps and they itch. There are many species of flea such as dog fleas, cat fleas, human fleas, northern rat fleas, and the oriental rat flea.

Historically, fleas have been involved in devastating epidemics of plague throughout the world. Today in the U.S., fleas primarily are annoying biting pests of pets and people. The most common species is the cat flea, Ctenocephalides felis.

2024年5月27日 · A flea is a tiny, parasitic insect known for its ability to jump long distances and its preference for feeding on the blood of mammals or birds. Fleas are tiny blood-sucking insects that live on the external body of a host. They are a constant annoyance for cat and dog owners; more than a billion dollars is spent every year on treatment. While ...

2021年1月6日 · Signs of a flea infestation include seeing fleas hopping on your carpet or furniture, or noticing your pets obsessively chewing, licking, or scratching themselves. Fleas are tiny,...