Can anybody advise me please regarding electronic tagging of small objects? I am thinking of mouse-sized to dog-sized objects, and very small tags with good batteries that would emit signals every day or so to indicate their position. Thanks for any advice you can give - please forward to others who may be interested. JOHN BIBBY PS: I'm not thinking of social research where the possibilities might be endless. But what about the ethics of tagging? You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.