Proceedings of the 1993 National Cave and Karst
2018-8-25 · The purposeofthe gate wastolimit human accesstothe rearofthecave where bats tendtoroost and where there arewell-knownhazards, suchas'bad air' anddifficultcrawlways.The gate,whichcovered 15-16m 2ofpassage area, weighedabout1,000kg and was designedtoallowbatstoflybetween the bars,whichwere14cm(5.5in) apart.
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