They should make a super giant gorilla thingy that drops big monkey bones! It could live on Karamja and Ape Atoll and could also drop a giant monkey carcass and maybe something like herbs, armour, weapons, useful stuff? They could make it level 28 and it could drop chaos/law/lots of mind/nature/etc. runes. If they don't more dragons, unicorns and bears should added to f2p.