Nashribon 1950 Turkey Vulture Oct. 29 5 km. N. Villavieja, 1400 ft., Huila, Colombia, S. A. a challenge. Once I saw a Caracara run about 20 ft. to chase away a "Pichilingo". At one time I looked up to see what appeared to be mating (but may have been a fight) between two Turkey Vultures. The two birds stood almost breast-to-breast, with heads moving up and down, apparently pecking at each other. One obtained a grip on the other bird's neck, and, maintaining this hold, maneuvered onto the other bird's back. The two remained thus, actively struggling, with wings partly extended, for about 10 seconds, then broke apart. The aggressor showed no further interest in the other bird. At about 10:30 P.M., beside road to Villavieja (from camp) near Quebrada Lajas, I found a Turkey Vulture sleeping in a tree. The woods were fairly dense and mesophytic at this point. The bird had its head tucked under a wing, and was not aroused immediately by the light. Its perch was a 1" diam. limb about 10 ft. above ground. Nov. 4 see Black Vulture for this date.