Birds typically have a large sternum with a bladelike vertical protrusion to which flight muscles attach called:

Name: Birds typically have a large sternum with a bladelike vertical protrusion to which flight muscles attach called:
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The bladelike vertical protrusion on the sternum of birds is called a keel, which serves as the attachment site for flight muscles. The other choices are bones in the bird's wings, but do not refer to the prominent feature on the sternum.

Birds Typically Have a Large Sternum with a Bladelike Vertical