Skill: Knowledge: Nature
Knowledge: Nature is about the natural world, understanding, and commanding animals and magical beasts. It also includes being adept at living in the wilderness, foraging for food and building shelter, and tracking.
Mechanically, Knowledge: Nature is used for understanding and navigating the natural world. Traditionally, Nature would be used as it's namesake and the 'Survival' skill and all that usually entails (such as foraging and tracking). Talents for Knowledge: Nature help cover bases for those who wish to be better at, or even craft, healing supplies.
Knowledge: Nature uses INT / Intelligence or WIS / Wisdom by default. Knowledge: Nature is a Primary Skill, meaning it is a major skill that can only be gained by mechanics that grant proficiency. Additionally, it is a Knowledge Skill, which means it is a skill that requires a bit of input from the player and the GM to be used effectively, as well as a little bit of intuition on the player's side to use well.