Flea.

Fleas flourished in the sand and dust of the Holy Land. Classified as parasites, these tiny insects attach themselves to a body and suck blood from their host. Fleas have no wings, but they do have strong legs and can jump several inches at one leap. The flea that lives on man is tiny, but it can be very irritating. David described himself as a mere flea being pursued by a king (1 Sam. 24:14; 26:20). He may have seemed insignificant, but he irritated King Saul.

Source: [Anon-Animals]