![]() ![]() Only a small amount of venom can cause serious illness as the poison attacks the nervous system. Black widow spiders are highly venomous and can be deadly, especially for the elderly and children. The web of black widows is not symmetrical but is messy with silk strings going every which way. Indoors, they can be found in sheds, garages, and in undisturbed, cluttered areas in basements and crawl spaces. Outdoors, black widows prefer to live in woodpiles, rubble piles, under stones, and in hollow stumps. The male black widow is light brown with lighter stripes on the underside and is smaller in size than the female. The marking may range in color from yellowish orange to red and its shape may range from hourglass to a dot. The female is normally shiny black with a red hourglass marking on the underside of the abdomen. ![]() Black widows have bodies about ½ inch long. The western black widow spider is the species found in Colorado. They migrate in waves in the fall looking for mates. Tarantula spiders are found in Colorado but primarily in the southeast plains region and not near Denver.The largest and most striking of the orb weaving spiders found in Colorado is the harmless banded garden spider. They are usually brownish in color with a large and prominent abdomen that is dimpled and marked. Some species, known as “barn” or “garden” spiders, make geometric webs among vegetation, buildings, windows, or outdoor lighting. Several orb weaving spiders are commonly found outdoors late in the season.Wolf spiders occasionally enter homes, but they are normally shy and not dangerous to humans though large species can bite if provoked. Also interesting to know, a wolf spider’s eyes reflect light so if light is shined on them in the dark, their eyes will supposedly glow in the dark. An unusual characteristic of female wolf spiders is that she’ll carry the egg sac attached to her spinnerets the newly hatched young can then crawl on the female’s back for the first few weeks of life. They are active hunters that do not produce a web to capture prey. Wolf spiders are very large, very fast and can be brown or grey.They are very long-legged and often confused with daddy-long-legs. Cellar spiders are usually found in dark corners of cellars, crawl spaces, and garages.Medical attention should be sought if this is the case. Certain people bitten experience sever pain around the bite site, heavy sweating, muscular pains, vomiting, headache, and giddiness. Black house spiders can look like black widows but lack the red hourglass on the abdomen. They prefer dry habitats in secluded locations, such as window framing, under eaves, gutters, in brickwork, sheds, toilets, in dark corners, and among rocks and bark. ![]() Cobweb spiders/house spiders generally have a bulbous body and spin a lacy messy web.Ground spiders are harmless to humans and are most often found under rocks or logs where they build silken retreats and emerge only to hunt.Jumping spiders are also common and are active hunters who stalk and pounce on their prey. ![]() They are sometimes mistaken for the brown recluse (covered in more detail further down on this page). They produce dense mats of silk in areas such as shrubs, thick grass, or corners of buildings.
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