Hi mate,
The previous thread is bang on, go out withought the gun (you will concentrate much better) and make note of the weather and the time of day and the month you are in.Do this on a regular basis and learn their habits on your permission.
You will soon learn how to intercept their habits,- but do "your learning of their habits" always at distance.
Build a "natural hide" as close to their habits as you can get when you know they are not around and let them get used to it being there,- then strike.
best wishes