Passage Summary: Bats stay deep in caves where the temperature never changes, yet they somehow manage to head outside more often on warm nights when their insect prey is most active.

Reasoning: Bats feed on insects that are more active on warm nights, and while bats leave their caves more frequently on these warm nights, the temperature inside their roosting area remains constant.

Analysis: The central paradox here is a lack of sensory input: if the temperature inside the cave is always the same, how do the bats know it is warm outside? To resolve this, we need an explanation that provides an alternative environmental cue. Look for an answer that suggests a way for the bats to detect outside conditions—perhaps through changes in air pressure, light, or even the sounds of insects—without needing to feel the temperature directly. The successful response will bridge the gap between the static internal environment and the fluctuating external one.