Though Dododex says this is ranked #1 for poly collecting, the club is way more efficient. Using a club often gets you 4 or so more. (If you could add tools to resource collecting, dododex, it would be much appreciated :D)
Can easily over encumber itself gathering organic polymer. However, using a quetzal as a carrier of both the animal and the polymer can allow for very successful polymer runs. Sometimes bringing in excess of 1000 in a hour run on an island server.