As someone who has used old-fashioned radio-tracking to follow animals, I welcome the new developments in tracking equipment. The amount of data collected is immensely greater than that collected in a traditional radio-tracking study. GPS tracking would be particularly useful in hedgehogs, as much of a hedgehogs evening may be spent in enclosed gardens where they are difficult to track. However, it has so far been found tricky to use on hedgehogs as signal may be weak under the scrubs and hedgerows where hedgehogs often spend their time.An additional problem is making the GPS tags small enough; radio-tags for hedgehogs are often 10g or under, which is mainly battery. With the speed of new developments in the field I have no doubt that these problems will be overcome, and GPS tags will soon be the favoured method for tracking hedgehogs.