Diabolos.Phoenyyx said:
Rabbits, tigers and buffalo in Uleguerand Range. Plenty of mobs and 5-minute respawns should make for a quick trial.
This is why I did. But the area right at the start of the zone wasn't so great; I moved over to Bonnacon's pop area and focused only on rabbits and buffaloes (there are no tigers there). Bonnacon actually popped 3 or 4 times while I was doing it, and I killed him each time (though no drops). He does count for the trial though, being an exp-yielding beast. :P