> Could the great filter be something like developing language?
Perhaps it's a combination of factors?
Dolphins are social animals that appear to be capable of complex communications among themselves, but don't have hands to manipulate their environment the way we can.
If it's made with proper merino wool then that would explain the price.
I've bought merino jumpers in that price range before, and they're well worth it since they're warm but also light-weight.
That raises another issue of the planet having a magnetic core...