"They're ectotherms! Ecto-freaking-therms!" D-29 screeched, making sure to remind Sid to inform their Host that they were currently sharing the tunnels with, and being chased by, creatures that common thermal scans would have a terribly difficult time detecting!
Because these things relied on their surrounding environment to regulate their body temperatures, their surfaces were practically identical in temperature to the cold tunnel walls, producing almost no thermal contrast whatsoever!
Unlike other cold-blooded creatures that would normally retain at least some detectable metabolic heat, these particular beings seemed to generate so little of their own that the mechas' sensors had practically failed to detect them until they were right in front of them!
Had these guys not eaten in so long that even now, when they were clearly creeping toward the mechas like this, their sensors could barely detect anything noteworthy?!
