Alfred Hitchcock really tried, but even despite his 1963 thriller The Birds, no-one really finds our feathered friends all that scary. Maybe an enraged swan could do some damage, but anything smaller than that is never going to pose a threat for us big humans. What are they going to do, peck us to death? Beat us about the face with their tiny wings?
Nope, birds aren't scary. That is, unless they decide to band together and form a creature much bigger than themselves. One that strikes terror into the hearts of us puny mortals. Like a tyrannosaurus rex. Like a jaguar. Like... a dolphin? Come on guys, that's still not even close to being scary. You're going to have to do way better than that.