Okay so logan is 200 years old and I bet he's spent a lot of that time in the wilderness so I bet he knows everything there is to know about plants; weather it's poisonous or not if it's edible and how to cook it, the medicinal property of the plant he's probably documented each one by hand cause God knows he has the time and why not, he probably knows about a lot of extinct plants and has a few of them he's trying to bring back. He also probably know every animal on the planet and everything there is to know about them. I like to think that logan considers himself a kind of keeper of the wild, or at least I do. I also think that if he has a strong enough bond with a human, mutant, or animal he forms a telepathic link with them (it's already happened with psylocke) and they can get some kind of healing thing from this as well.
That's all I have for now