Springtails (order Collembola) are very small, jumping insects that sometimes alarm homeowners by appearing in large numbers in moist indoor areas such as kitchen sinks, bathtubs, and in the soil of houseplants. They may also be found outdoors in swimming pools, moist landscaped areas or vegetable gardens, and on the surface of mud puddles. They usually appear in the spring and summer, but can be found year-round in moist environments. Because they jump when disturbed, springtails are sometimes confused with fleas. Springtails in most cases do not bite humans or pets, nor do they spread disease or damage household furnishings. They are mainly a nuisance by their presence.