Out here I live amongst the deers, I can see up to 200 in a 100 miles drive in the evening,a few years back I hit one with my full size Chevy van, many thousands $$$$ damage, hair all the way up to the tip of the antenna, it jumped out of the ditch, flew across my windshield, but luckily hit on the right side......otherwise I probably would not be here.After that I bought Deer Whistles.....waste of money unless you like to see them shake their ears as you pass by. Most of the deer here are Mule Deers, they have pretty big ears.......!
After that I bought an electronic Deer Scarer, similar to that one:
It was advertised as effective against just about any animal in the world, Deer,Possums,Kangaroos, Cats, Dogs.......enough to fill Noah's Ark......! I Bench tested it first, waited for the deer to come for my compost and turned it on.......well,they did lift their heads and shook their ears, but quickly went back to eating my fruit peels.....!The thing also emitted a constant high pitched sound , and I did not want that coming out of my vehicle, so I returned it.
Whatever you choose to do, do not honk at them
, that will confuse them and they may turn around and hit you, it happened to me twice and I had the dents to prove it.....!
You can always spend your money on this:http://www.buckpeterson.com/original.html
My brother in law, who spends a lot of money every year deer hunting and never bags a deer found a doe with a broken leg in the ditch right by his place, got his gun, gave her the "Coup de Grace" and ate her.....best deer he ever had he said. Now for that Mexican guy in Baja California who slammed the brakes in front of me and sent his kid running back to a" Road Killed" Armadillo....but that is another story, and I can only presume the ending....!
Interesting one about scaring the cows however, there is open ranges out here and in the fall the cattle comes down the mountains and hangs out on the road......but like the deer, they easily get confused and unpredictable.On my last ride of the year the curves were full of shit, had to slow down a lot.In Thailand while riding an XL250 we were chased by a cow for quite a ways, I had to shout at my riding partner because he had not seen it and that thing was really coming for us.....
I spent a lot of time in my youth on dairy farms and had never ever seen or heard of an agressive cow.