Trumpet
Well-Known Forumite
My granddad sold his best homing pigeon 56 times.These do require a power supply for the charging facility, but Husqvarna do a solar powered one. It occurs to me that they could be programmed with their 'home' location and could then realise if they had been stolen. Being solar powered, they could then escape and make their way home, using a sat-nav type device..