Here's an easy way to deal with alpha raptors : step one : once you get to lvl 35 you'll get the hunt terror bird pursuit make sure to unlock the sword.. then use a flyer like a pteranadon to go to he redwoods.. you can use a sword to kill them like the pursuit tells you or use something else to kill it like the flyer you have.. oh yeah I forgot you need lvl 38 for a pteranadon saddle so wait until you have that then go do it..once you kill three the pursuit is completed and you'll get an ascendant sword that can do up to 800 damage if you have high enough melee damage... 236%.. then if you dont have a raptor already get a raptor and put a saddle on... then clear out all the normal raptors that you don't want cause they can pounce you.. an alpha raptor can't pounce once your done clearing all the normal raptors nearby pounce the alpha raptor with a tamed raptor and use your ascendant sword to finish it off. You can use weopons on a raptors back.