Low level tip:
If in the Tundra or on SE and you find yourself being chased or want to get rid of certian aggressive tames in large packs, definitely killing them all just run to the other side of one of these bad boys and...
Absolute godsend for meat runs in caves. Only things that'll aggro up on it are Pirhana, Megalania and (presumably) Megalosaurus. Otherwise, everything else (including Arthropleura and Sarcos) won't aggro. Have at 'em!