Two sternal plates are present, connected to sternal ribs.
2.
The third and fourth rib have expanded lower ends that in life probably were attached to cartilaginous sternal ribs, themselves connected to sterna that in the holotype specimen have not ( yet ) ossified.
3.
Ostrom described " Deinonychus " as being extremely birdlike, with avian features such as a furcula, large sternal plates, horizontal posture, a birdlike spine, and ossified sternal ribs and uncinate processes.
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