I see where your coming from LisaRose ,
I often wondered how birds knew their were fish in the waters ,rivers and oceans that was food for them to eat.
Another one was how did bears know when Salmon were even in the rivers , let alone when they were migrating upstream to breed , and was food for their taking.
It`s easy to say they instictively knew that , but HOW ?
Why would birds who live on the land and fly in the sky even know their was a source of food beneath the waters.
And the same can be said of bears , why would that concept even enter their brain ?
I shall have to look at the link you mention in more depth to see if it answers my questions.