Other mistake: If the flying creatures sense heat, then the junkyard should have a lot of heat signatures, but the aerial photograph has none.
Movie Nut
20th Oct 2017
Tremors 3: Back to Perfection (2001)
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Suggested correction: It wasn't an actual, fully operational junk yard with car crushers, cranes etc. It was just an area that the residents had designated a junk yard.