Years ago here in PA they had something like a dog collar with a big battery/electronics packet on it.
I saw 2 a couple years apart, let them both pass. Both were doe.
Had Game commission guys give a talk on the tagged deer at my local club. Interesting how they scatter during rut, and the travel some do.
One swam the Susquehanna river almost every day. That was amazing.
Also had talks on elk, otters, bob cats, and fishers. All very interesting.
