They have the best eyesight of any animal on my place i swear they can see one of them neighbor cats 1000 feet away in the woods at that, once mine were honking at the fence, i could not see a thing when i got there but they were rubbernecking and honking their heads off , i stood there a good five minutes watching them watching something trying to figure out what they saw, i figured it musta been a snake cause they were looking in the heavey growth on the fence, finely i saw it move, it was a rat snake but man it sure blended in, i turned my head away for a second and then looked back and even knowing where it was i had a hard time seeing it again, see them do the same thing on a tree stump that had new growth on it, turned out to be a little bitty ol frog.
Had a peacock on the edge of my roof the other day honking and looking towards the fence row 50 foot away , again i saw nothing then a vole hoped out of the brush and ran into another weedy area, pretty impressive eye sight indeed.