Abstracts
The class Aves is a large & varied taxonomic group consisting of 8700 species, 70% of which have been worked out karyologically Avian chromosomes are characterised by a high diploid number. 61% of the species have a diploid number of 78-82. The chromosomes of the Birds are differentiated into macro and micro chromosomes: 70% of the species have 7-9 pairs of macrochromosomes, the rest are microchromosomes. Birds have been extremely conservative as for as chromosome number are concerned, both increases and decreases have been infrequent.
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