Around Neorthem Wheat Plantation are some cave entrances, you can't miss them. One of them in screenshot.

Apparently you don't need knowledge on this one if you have the rest of the beast-ecology knowledge. Not sure, this was the last one, b4 calpheon worm-unsure.

http://www.imagebam.com/image/4293771368607856
http://www.imagebam.com/image/0c9f861368607859

You have to go inside a cave to find them ! Inside Cave you have BABY WARAGON and WARAGON .... 2 knowledge !
Check Screenshots

The knowledge inside the cave.You can see one of the entrances.On this screenshot.