I have placed this on the Selby to Market Weighton train line that is now a bridleway. It's a nice walk and if you have kids they are free from the risk of cars but watch out for the odd cyclist.
The quoted coordinates are a random point on the bridleway to get final location of cache you will have to solve the puzzle.
The cache can be found at N53 50.ABC W000 46.DEF
A = Wren - Chaffinch.
B = Robin - Magpie
C = ( Starling + Blackcap ) - ( Blackbird + House Sparrow )
D = Bluetit - Greenfinch
E = ( Dunnock + Chiffchaff + Wren ) / Great Tit
F = Collard Dove x 3 / Wood Pigeon
Thank you to Unstable Boron for the idea for this puzzle.