LL Wolf 1963 Aug 15 Duet Aimophila sumichrasti by J.R. Alder 5 mi. e. of Teluantepec, Oaxaca On several occasions "dueting" was closely observed in this species. In all instances it may be described as follows: two birds (assumed to be members of a pair) come together, generally 1-4 feet apart, and perch. One bird (assumed to be the ♂) in most instances begins the "duet", which is a speeded-up version of one of the songs with the emphasis changed, and the other bird (assumed ♀) joins in. During the performance the birds often face each other but not always; they may both face the same direction. Each "sings" with its bill open and often pointed upward. The body seems to jerk with each note and consequently the tail and wings, which are held rather loosely at the sides, appear to quiver. The finish of each "duet" is variable.