Unique Bones
Sarcosuchus uniqueItem
Sarcosuchus osteoderms, the unique item for sarcosuchus
Stack Size 64
Unique bones are items that can be obtained from mining a Fossil block or by killing prehistoric creatures. Almost every species has a unique drop.

7.2 UPDATE Edit

In this update, coelacanth, nautilus, all birds, and all mammals were lacking unique drops. These bones were basically useless, as well; they did not craft anything, did not make bonemeal, and did not create DNA.

7.3 UPDATE Edit

Birds and mammals have gotten unique bones, but the three fish and nautilus still do not have any. They can now be analyzed to get DNA, but still do not craft or make bonemeal.