Flea

The Common Flea Pulex irritans is one of the fleas that are parasitic on man, but there are other subspecies that also live on dogs, camels, and other mammals. Fleas are very small (about 1.25 millimeters [0.05 inch] long) black jumping insects that suck blood in their adult phase, inflicting itching bites as they do so. Scratching the bites can easily cause infection. Their hind legs are adapted for jumping, and the required tension before a jump is produced by a special sticky protein. The flea strains its leg against the adhesive, and when it snaps free the legs release a surprising amount of energy. A flea less than a millimeter in length can jump well over a meter, that is, more than a thousand times its own length.

Fleas are a troublesome pest, breeding in dirt and dust. The people of biblical times had no defense against fleas, and in houses with mud floors the problem was acute. If fleas got too bad, there was no choice but to move to another house.

Another species of flea (Xenopsylla cheopis) infests the black rat and is the carrier of bubonic plague. See 2.27 Mouse, rat.

In the Bible

The Hebrew and Greek words for it, and every verse where each is used

What it stands for

The flea was a symbol for an insignificant troublemaker, a nuisance who was of no great importance.

Also in Insects, spiders, and worms

Sources

Plants and Trees in the Bible, Animals in the Bible and Human-made Things in the Bible © United Bible Societies, 2025 (adapted from Each According to its Kind: Plants and Trees in the Bible by Robert Koops, All Creatures Great and Small: Living Things in the Bible by Edward R. Hope, and The Works of Their Hands: Man-made Things in the Bible by Ray Pritz), CC BY-SA 4.0; adapted for eRhema