Abstract

The somatic chromosomes of seven species of Passeriformes belonging to six families have been studied. The diploid chromosome number varies from 68-80. These species possess each seven pairs of macrochromosomes, except Acridotheres tristis and Acridotheres ginginianus, which possess six pairs of macrochromosomes including the ZZ chromosomes.An identifiable W-chromosome has been found in all these species. It is either intermediate in size between macro- and microchromosomes or is of the size of the large microchromosomes. It has been found to be m, sm or T type chromosome.

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