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For many years, field studies of birds have suggested that territorial individuals may be attracted to one another, forming territorial clusters independent of resource distributions. However, virtually no experiments have studied these phenomena in either the laboratory or the field. The present field study was designed to test whether prospective territory owners preferentially settle near conspecifics and form territorial aggregations when territory quality is held constant. Juvenile Anolis aeneus lizards arriving at juvenile habitats in clearings were given a choice of artificial homesites arranged around a clear-walled enclosure divided into two parts, one of which contained resident A. aeneus juveniles. Juveniles showed a clear preference for the homesites adjacent to the established territorial residents (the "experimental" homesites). In each of eight trials, the first arrivals appeared on the experimental homesites …