Assertion: common vampire bat | /r/CapableOf | have increased in number
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text: During the 20th century, Common vampire bats appear to have increased in numbers as the numbers of livestock ranches grew, and it also seems that vampires have been moving northwards since the 1950s: in 1967 a Hairy-legged vampire Diphylla ecaudata was shot dead in Texas (Reddell 1968), making it the only vampire yet reported from the USA in modern times.