Tom,
If you think deer are hard on fences you ought to see what moose can do to a piping set up in a "Sugar Bush". (No comments Boo!) Now-a-days maple syrup outfits use plastic piping with main lines fed by hundreds of individual side lines from each tree in the grove that eventually run to the facility where a suction pump keeps a vacuum on the line at all times.. Yup, they suck the trees dry! (Well, not really, but you get the idea.)
Anyway, now and then some fool moose will blunder into a sugar bush and rip up miles of plastic pipe! They make one hell of a mess! Other critters like to chew on the stuff and that's almost as bad!
Rog