As a 20-21 BLU, I get 120-150 exp on these with up to chain 3-4 for 150-180.
Not to mention Beastmen Seals every other leech. They drop them folks.
30 seconds or so spawns. Just be sure to pull from BEHIND, died just now pulling from the side. D:
EDIT: These come from Gigas Trappers btw.
Edited, Feb 10th 2007 2:45am by Rurode