Interesting info. I work a lot with natural materials (antler / bone). There are numerous difefrences among species. If you look at the range of antlers: they vary from very porous (european deer) to completely dense (elk / axis / reindeer / ...). Regarding the sea cow: I have a big chunk at home / will take some pictures. Stellar sea cow is allready extincted / lots of their bones are found in norhern regions and can be used without problem.
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