Nature will and has found a way, it's all in her bag of tricks. Like my grandmother used to say, "We're all born with a suitcase (or a 'black box'), and everything we need is in there when we need it." Basically, Nature packed our suitcases, so just reach in and take out what you need to survive.
A trail goes two ways and looks different in each direction - There is no such thing as a timid woodland creature - Whatever does not kill you leaves you a survivor - Jesus is NOT a bad word - MSB