The movie Jaws sums up this idea well:
The shark in Jaws goes where its' needs are supplied and then moves on. I would think a potential Bigfoot would be this way as well be it food, mating and so on.
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Brody: Is it true that most people get attacked by sharks in three feet of water about ten feet from the beach?
Hooper: Yeah.
Brody: And that... and that before people started to swim for recreation - I mean before sharks knew what they were missing - that a lot of these attacks weren't reported?
Hooper: That's right.
Brody: Now this shark that... that... that swims alone...
Hooper: Rogue.
Brody: What's it called?
Hooper, Brody: [together] Rogue.
Brody: Rogue, yeah. Now this guy, he... he keeps swimmin' around in a place where the feeding is good until the food supply is gone, right?
Hooper: It's called "territoriality". It's just a theory that I happen to... agree with.
Brody: Then why don't we have one more drink and go down and cut that shark open?
Ellen Brody: Martin? Can you do that?
Brody: I can do anything; I'm the chief of police.
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Basically, we complicate all these Bigfoot Q too much. If bigfoot is real it is an 'thing' like a person or an animal that would have basic needs and act on those needs. This is spelled out in Silence of the Lambs:
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Hannibal Lecter: First principles, Clarice. Simplicity. Read Marcus Aurelius. Of each particular thing ask: what is it in itself? What is its nature? What does he do, this man you seek?
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What does Bigfoot do/ need/ require? Apart from a random encounter, understanding that with any degree of certainty is the only way to catch him.