특작12회 41번

Perhaps the most obvious way in which birds differ from men in their behavior is that they can do all that they have to do, including some quite complicated things, without being taught.

해석좀해주세요

그리고 여기서 obvious way를 꾸며주는게 which절인가요??? 문법적으로도 저게 어떤 문장인지 모르겠네요
in which가 나왔다는 말은 obvious way가 which절에서 in 의 목적어의 역할을 한다는 뜻이아닌가요?
그걸넣어서 해석하니깐 잘 안되서요..