Although the White-collared Seedeater is fairly common and widespread, it's natural history remains poorly known. There is little or no information on topics such as age at first breeding, life span and survivorship, dispersal, or population regulation. There also are few studies of diet and breeding biology. Even the plumages and molts are poorly known. Furthermore, the causes of the significant population declines in south Texas should be investigated, to determine if human activity was an important factor in this decline.