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Though the swifts depend on the cave for shelter,
they never stray further than the limits of daylight,
as their eyes can't see in the dark.
However,
deep inside the cavern,
other creatures are better equipped for subterranean life.
A colony of bats is just waking up,
using ultrasonic squeaks
to orientate themselves in the darkness.
Night is the time to go hunting.
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