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(FILES) In this file photograph taken on November 6, 2020, a mink looks out from its cage at the farm of Henrik Nordgaard Hansen and Ann-Mona Kulsoe Larsen as they have to kill off their herd, which consists of 3000 mother mink and their cubs on their farm near Naestved, Denmark. - First it was snakes, and then the endangered pangolin before badgers were put in the dock. Scientists have been scrutinising a Noah's Ark of animals to find out whether -- and how -- the coronavirus was transmitted from bats to humans, with the prime suspect changing from one study to another. Researchers at the South China Agricultural University said in February 2020 the endangered pangolin, a mammal whose scales are used in Chinese medicine, may be the "missing link" between bats and humans. (Photo by Mads Claus Rasmussen / Ritzau Scanpix / AFP) / Denmark OUT (KEYSTONE/Ritzau Scanpix/MADS CLAUS RASMUSSEN)