thats my main species i stalk and i have learnt through experience. A good book to read
is donald and norma chapman on fallow deer. Bought my copy from here:
chapman deer book fallow history distrbution & biology | ebay
how to sum up fallow in one post, hmm, now you see them now you don't! Don't plan your christmas dinner on a fresh haunch, plan it weeks in advance and freeze as much as you can! Once you get into them they can just dissappear, or become nocturnal! Try to take them out on their 'motorways' as opposed to feeding grounds. They can be quite nomadic. And as with any deer species, expect the unexpected. They may never have been feeding on a particular field ever and certainly not in the day time, but there they are running off because you didn't spot them!! I am sure lots of other people more experienced on here than me, but a short summary all the same.
And a last point, they can be very heavy! I had a buck last season weighing 80kg gralloched. Glad i picked well as to where i shot that!
All the best and have fun!