I have collected quite a few knives over the years while pursuing the best hunting knife, which as we know varies on what the game and task is. My Favorite knife for small game is the Mercator k55 a favorite of the possum trappers in NZ there are cheaper copies around and some of them are quite good I even have a couple of those as well in my collection, but the original has a blade made of good quality steel and doesn't loosen on the pivot over time and stays tight over the years folds to a small package. I highly recommend them.
Otter Messer K55K Mercator Black Cat Pocket Knife Solingen - Stainless Steel 4045011100222 | eBay