So far, the guesses are:
large herbivores--maybe mastodons--need a willing elephant to taste test
decay--ie, meant to just drop and rot
stuck to wild horses' feet--might work; they're certainly gluey enough
flotation --haven't been able to test this one as they're gone for the
year--anybody got a fresh one and a bucket of water?
current distribution patterns seem to involve juvenile Homo sapiens. Word is
they make great (if temporary) softballs.
Keep the ideas coming!
Happy Thanksgiving,
Monique