View All Media 16 Images and 8 Videos. The two caeca or blind pouches are about centimetres long in the adult. The feathers on the wing are divided into flight feathers remiges , further divided into primary and secondary flights and coverts. The skeleton of birds shows numerous modifications for the demands of flight: A horny sheath that covers both jaws of a birds' beak. A specialized organ that is an enlarged part of the oesophagus, where food is stored until it can be digested later. It is suspected that this may be one way that a bird may visually discern the sex of other birds, through the differences in ultraviolet color in the feathers.
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