The issue with a wildlife camera is that the perp can easily remove it unless it’s placed in an in accessible place, if you can identify such a place and it covers the area required then that’s a good way forward.
Otherwise a USB powered WiFi hub and a simple 12v spy cam will do the job.
Personally I’d record each event and try to find a pattern, if one is found you may be able to anticipate the next event. You then have 2 choices
1. Go to the Police station and insist on seeing the duty inspector, they are compelled to grant this, but will try to stop you as a complaint at that level has to be investigated so they may well agree to take action instead, personally I’d stick to my guns and insist on seeing the inspector. Make a point of checking your watch and writing down the time and badge number of an officer you talk to as this puts responsibility on that individual. Make sure you use key words like “under personal attack” etc…
And be sure to make it clear that they have a duty of care and your next step will be the press using the info you’ve written down.
2. Deal with the perp yourself, but obviously you have to consider the outcome of this, but personally that’s where I’d be going.