By Ginny Reese Caddis-fly, Trichoptera Millions of moth-like insects that live and thrive along the Colorado River near the Nevada-Arizona border are "becoming a nuisance," reported the Las Vegas Review-Journal. The insects are called caddisflies. The United States Bureau of Reclamation is planning to complete a series of water reductions from a dam on the Colorado River to attempt to reduce the population of the caddisflies. According to the U.S. Bureau of Reclamation, draining the water will dry out the caddisfly eggs and larvae. Also, with the lower water levels birds and bats are more likely to eat the insects.