brightly coloured flying things (heli's and planes) tend to attract local birds.
indian miner birds tend to attack micro heli's and small planes.

Magpies are not fond of much at all during spring. Orange in particular seems to tick them off.

Orange and Red seem to incite attacks
I am trying to get some video of this from the plane's perspective on a teksumo during an attack but havent managed it yet.

anyways, that's a blog.