Well....
Ranger positions vary greatly, some ask for degrees, some ask for lots of practical experience, the term Ranger is used quite loosely.
Basically my position is a bit of both, they wanted academic qualifications, of which i have a few, however most of it seemed to come down to practical experience,, of which i have a wagon load. It goes hand in hand with the job specification, ie office based, more qualification, site based, more practical experience...generally
I think the key things were....
Lots of practical experience in habitat management (woodland, heath land, grassland)
Lots of estate management (post and rail, stiles, gates etc)
Knowledge of fauna and flora
Understanding of wider concepts of site management (visitor dynamics, troubleshooting)
Qualification in certain tools like chainsaw, off road vehicles etc
Experience of community involvement (both on a wider scale and simple things like giving walks)
..and also some sort of ` catch`, something above and beyond the "essential" (must have to not throw the application in the bin) and "desirable" (must have to not throw the application in the bin having read it...a bit) qualities. For me this was coming from a forestry background and having previously taught woodland management and also my bushcraft, having knowledge of the skills that those who inhabited the iron age hill fort (the remains of which are on the site) would have employed and as I discussed with them, Bushcraft is a fascinating way to engage people in a new way with understanding nature, a tree is no longer just a tree, which for a 9 year old is neither here nor there.
I was also lucky enough to attend a Ranger training course a couple of years ago which is a huge help in giving you a leg up in a field you have not yet entered(Losehill in the peak district if anyone if looking for something similar).
There are plans flying around to standardise what a `ranger` is and what they should be able to do which i think is a good thing.