Not to hyjack your thread, but last night my husband and I were talking about this for our backyard chickens after I found yet again another hidden nest. He is an electrical engineer specializing in small electronics, and currently works with RFID, bluetooth, and GPS devices. Since we couldn't find anything for our needs he was talking about designing something. So the question is. What do people want in a chicken GPS tracker? We were thinking of a leg tag. How long a battery life would it need, distance or range, would detecting non motion (aka lay egging, broody, etc) be helpful for those hidden nests? Would you pay more for this feature? If we were to make an app to connect to a smart phone, what other features would you want. How much are people willing to pay for a tracking system? What problems are you trying to solve by tracking your chickens? If we can get enough interest and get the cost down we could possibly do a KickStarter this summer.