The present study aimed to throw light upon the os coxae and synsacrum of common hawk cukoo and yellow billed babbler. The pelvic girdle was formed by ilium, ischium and pubis in both the birds. The ratio of preacetabular to postacetabular part of ilium was 1:1 and 3:2 in common hawk cukoo and yellow billed babbler respectively. The lateral border of post acetabular part of ilium showed a prominent projection behind the foramen ischiadicum in yellow billed babbler and it was absent in common hawk cukoo. A small pectineal process was noticed at the anterior end of the pubis below the level of acetabulum in yellow billed babbler and it was absent in common hawk cukoo. The synsacrum of common hawk cukoo and yellow billed babbler consisted of 11 and 15 vertebrae respectively. The differences in osteological features of os coxae and synsacrum may be due to their habits.

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