Not much scares those big birds. We have both golden and baldies that live here year round. The goldens live on our property, the baldies live very close by and both cruise through the chicken yard on a regular basis (along with five kinds of hawks and two kinds of owls, oh yeah, and black vultures - a metric butt ton of black vultures). Noisemakers, cds, bright ribbons, fake owls, don’t work. My best advice is to pen up the ducks and chickens and only let them free range when you can be very close. Vary the time too, our eagles figured out my schedule pretty quickly! I love to watch them, but that would very quickly change if one of them got one of my girls!