If I have a slayer task of monkeys from burthorpe, does it include all monkeys? like even the big mahoosive ones from on ape atoll?

Yeah, you get 133 slaying exp for killing the level 167 monkey guard :)

Ok thanks, I burthorped iron dragons, and thought I'd like to kill those big monkeys for big xp, which shouldn't be too hard with the altar there too :D

the only difficulty i had killing the big ones when i did monkey madness (i was level 75) is that they kept healing themselves, so it took a while just to kill one.