This is the flesh at the bottom of the bag. I have no idea what part of the animal this is, not a clue:
Anyway, the decomposition took nine months from start to finish. Afterwards, I cleaned the bones in batches, first in my S6 cleaner, then after that broke for a second time, in a slow cooker overnight, simmering in biological washing powder, changing the water two or three times, then drying in the sun.
I forgot to mention the other complication. Because the seal was young, the skull wasn't properly fused, and the ends of the longer bones were loose. Leg bones and other bones have growth plates, where new bone is produced, near each end of a bone. So leg bones (and other bones) of young animals have loose "caps" (scientists call these epiphysises). So a humerus (upper arm bone) which in an adult is just one bone could be as many as four or five bones in a young one. An adult vertebrae is in three or four parts in a child. A skull, which is fused in an adult, might be nine or ten parts in a child.
Any skeleton is a jigsaw puzzle but in a juvenile skeleton it's a jigsaw puzzle with maybe four times as many pieces. That's bad enough if it was an animal I am familiar with, like a deer, sheep or fox. But seals are more complicated still:
I had stored the bones in a box and this case:
And the first time I laid it out I found it very difficult:
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