Analysis of song of red-eyed vireos

Recordings of songs made from red-eyed vireos in Quebec reveal that the songs consist of short warbles lasting about 0.35 s. These warbles are composed from a repertoire of elements numbering 41 and 54 in two individuals studied. The elements may be sung alone or in combinations of as many as five elements. In one bird 46 combinations were noted and in another 35. Rules are considered how these combinations are formed. There is much variation between individual repertoires.