Although not a true spider, Daddy longlegs (order Opiliones) go by many names including harvestman, cellar spiders, granddaddy long-legs, carpenter spider, daddy long-legger, vibrating spider and skull spider. Daddy longlegs are closely related to scorpions (order Scorpiones) but, because of their appearance, are often mistaken as spiders (order Araneida or Araneae). However, unlike true spiders, in which the body is divided into two distinct segments, daddy longlegs look as though they have only one segment because of a broad fusion that makes the juncture between the two segments almost indiscernible. They are widely distributed and abundant in both temperate and tropical climates of both hemispheres.
The body of a daddy longlegs is 0.6 to 23 mm (0.02 to 0.9 inch) long, although the bodies of most species are between 3 and 7 mm (0.12 and 0.28 inch). The legs can exceed 15 cm (5.9 inches) in length. Many species of daddy longlegs are omnivorous, feeding on small insects, mites, spiders, snails, and vegetable matter. Daddy longlegs typically have two eyes located on a central knob on the front of the body although certain types lack eyes. Eggs are laid in the soil in autumn and hatch with the warmth of spring. Many species of daddy longlegs live less than one year, although some may survive for several years.
This individual was photographed on a screen door retroilluminated by the early morning sunlight where over 100 daddy longlegs had congregated to feed on small insects attracted to a nearby light left on overnight.