Dont have any sea eagles here in my part of the UK but the drone will sometimes wind the local gulls up. Usually they dont do much beyond making a lot of noise. However, watch out for Oystercatchers. Been attacked twice by these. They are fearless and will go in hard, also they get organised bringing their mates in for a coordinated attack. Got away by a rapid ascent, fast sideways move and landing. Still, the birds were there first and I try always to give way to them.