Your knowledge of nature informs your fighting style, and that style gives you insight into related aspects of the natural world.
Benefits: You gain a +1 trait bonus on all Knowledge (nature) checks, and Knowledge (nature) is always a class skill for you. You can make Knowledge (nature) checks pertaining to animals that correspond to your style feats untrained.
Pathfinder Roleplaying Game: Ultimate Campaign. © 2013, Paizo Publishing, LLC; Authors: Jesse Benner, Benjamin Bruck, Jason Bulmahn, Ryan Costello, Adam Daigle, Matt Goetz, Tim Hitchcock, James Jacobs, Ryan Macklin, Colin McComb, Jason Nelson, Richard Pett, Stephen Radney-MacFarland, Patrick Renie, Sean K Reynolds, F. Wesley Schneider, James L. Sutter, Russ Taylor, and Stephen Townshend.