#keel.carina  the median ridge on the breastbone of birds that fly
  supertype:  carina  any of various keel-shaped structures or ridges such as that on the breastbone of a bird or that formed by the fused petals of a pea blossom
  part of:  carinate_bird__carinate__flying_bird  birds having keeled breastbones for attachment of flight muscles

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