if you want to avoid them, take your flying tame and fly OVER the redwoods. above the treetops. you can do that or go around, or take a snow owl and keep the owl vision on to spot them and go around. you can also go on a griffin, but NEVER DIVE in the redwoods, because they can pounce you off your griffin. you can shoot off the back of a griffin if you want to tame them.