Abstract:1. "Twin feathers" described for various domestic breeds of pigeons have been found in Oriental Rollers in 12 per cent of the sides of the tails during each of the breeding periods. 2. Each studied twin feather originates in a single follicle. It shows either one sheath ("split feather") or two sheaths ("double feather"). 72 per cent of the feathers have been found in the middles of the tails, 23 per cent in the middle of one side of the rows of rectrices. 3. Twin feathers grow either out of one papilla and on… Show more
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