The US Customs thing is so complicated.

Back in the 1980s I worked at a Highland Outfitter in California and we had to deal with that constantly.

The law might have been changed, but at that time a "wool garment" and a "fringed garment" were separate categories.

The duty was much higher on "fringed garments" so kilts were sent to us with the fringe not pulled out. (I'd have to pull out the fringe when an order of kilts came in, for example 20 for our Pipe Band.)

Anyway, about various creatures that aren't 'sea mammals' I don't know.