Assertion: pigeon's number | /r/HasProperty | four caves
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Source sentences:
text: While on the surface this plan may seem farfetched, the U.S. agreed to develop the Bat Bomb for four reasons: bats are available in large numbers (four caves in New Mexico alone are each believed to be the home to millions of bats); bats can carry more than their own weight in flight (up to three times their weight); bats can hibernate for extended periods without need of food or water; and finally, bats fly in the dark, then find secluded places to hide at sunrise.