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“Some of the guard bats hung from the tall cardón cactus that partially blocked the entrance to the cave; some guard bats hung along the edge of the cave entrance. The presence of these burly guards, along with the big cardón cactus, created a formidable boundary, a wall of sorts that could be used for controlling entry to the cave. And for the Pallid bats controlling who could enter the cave was precisely the goal.” — Scott Bischke
Some of the guard bats hung from the tall cardón cactus that partially blocked the entrance to the cave; some guard bats hung along the edge of the cave entrance. The presence of these burly guards, along with the big cardón cactus, created a formidable boundary, a wall of sorts that could be used for controlling entry to the cave.
And for the Pallid bats controlling who could enter the cave was precisely the goal.