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One of the key difference between birds and dinosaurs can be found in the forelimbs is carpals (finger bones) that are fused.
The eight tiny bones that make up the wrist (also known as the carpus), which joins the hand to the forearm, are called carpal bones.
The Latin word "carpus" and the Greek word "karpós," which both mean "wrist," are the origins of the word "carpus."
In the human anatomy, the wrist's primary function is to assist the positioning of the hand correctly and the appropriate use of the extensors and flexors of the forearm.
The mobility of the separate carpal bones increases the wrist's range of motion. The only group of bones in the wrist of tetrapods between the radius and ulna and the metacarpus is the carpus.
In contrast to the metacarpus, the carpus contains bones that are not specific to individual fingers (or toes in quadrupeds).
The tarsus is the equivalent portion of the foot. The wrist can move and rotate vertically thanks to the carpal bones.
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