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Between 1983 and 1988 an intensive study on pop-ulation dynamics and behavior of the Monk Parakeet (Myiopsitta monachus) was carried out by the Centro de Zoologia Aplicada, University of C6rdoba. The Monk Parakeet is unique among parrots in building its own nest of sticks. Often the nest is integrated into a compound nest (Forshaw 1978) or lodge; these deserve attention because collaboration in nest building represents an important form of helping (Brown 1987). Reduced natal dispersal and delayed breeding also are considered important determinants of helping by favoring the accumulation of a surplus of nonbreed-ing individuals (Brown 1978). Natal dispersal and age at first breeding is of particular interest in Monk Par-akeets because the species shows at least some characteristics that suggest it is a communal breeder. Indications of an incipient degree of allofeeding also have been found in the …