Interesting concept, but I think it needs a little more clarity. For example, as a first level human wildshifter do I put my one wildness point into one special ability forever? Or could I put it into wild skill for 3 hours, then take it out and put it into wild sound for 20 minutes to talk to an animal? Or do I select what special ability to put it in the morning and it stays there until I get a full rest?

Also, maybe include an ability that gives a bonus to saves. All animals (to my understanding) have high fort and ref, and low will. Maybe let them spend wildness points to increase their fort and/or ref saves.