Mar. 30 Colorado River, opp Ft. Mohave, 500 ft. Clark Co, Nevada There are many pairs of Gila Woodpeckers in this area, and they are extremely obvious because they are so noisy. They all appear to be in pairs, and are strictly restricted to the cottonwoods. A bird shot today, in male plumage, was heavily parasitized with roundworms; the entire body cavity is filled. The body of this specimen (PMB 288) was preserved in formalin. I could not immediately find the gonads, at least partly because of the worms. Apr. 1 Snyder Ranch, 500 ft, 1 mi W Colorado River, Clark Co, Nev. The situation here is the same as at the river, pairs of birds in the cottonwoods. Red shot 2 & today, one of which was full of roundworms. Apr. 3 1/2 mi NW Snyder Ranch, 500 ft, Clark Co, Nevada I heard a drumming on a dead cottonwood snag, couldn't see anything. When I squeaked, a Gila flew out of a hole 12-15 ft. high in the snag. I shot it and it was a & (PMB 316) with enlarged testes. No parasites. Apr. 4 Calif-Nev Line, 500 ft, 1 mi W, 1/2 mi's Snyder Ranch Clark Co, Nev. Shot another & here, not sticking to cottonwoods but moving a good deal, in willows, etc. This bird had just a few roundworms in his body cavity. Heard a pair here the next day.