Scientists have described more than 2,000 species of fleas. All species of fleas, without exception, feed on the blood of warm-blooded animals or birds and are not distinguished by attachment to their carrier, with the exception of insects that parasitize bats.
In the post-Soviet space, such species as fleas, dogs, cats, earthlings, humans, parasites of rodents, birds, rabbits are common. It is difficult for an inexperienced eye of a philistine to distinguish them among themselves, given the miniature size of insects and their ability to migrate. You can see obvious differences only in photos that are widely represented in the gallery headings.