During the breeding season, the male performs an acrobatic courtship display, darting up into the air fluffing up all his feathers, especially those on the pale green rump, then spiralling down to the original perch. Once he lands, he spreads his tail and droops his wings. The adult Common Iora is about 25cm long. The breeding male has black or greenish upperparts, and bright yellow underparts. The flight feathers are blackish with an obvious white wing bar. Non-breeding males have uniformly greenish upperparts. The females are similar to non-breeding males, but with grey-black wings.