"Many of them are old, and they would make poor learners," one expert says. "If they saw men, their past experience might tell them that they could get fed, and the result is that they might injure people or get hurt themselves."
「它們都老了，學習能力比較差，若一見到人，過去的習慣使它猜想有人就會得到餵食，結果可能會傷人或再度受傷害」，學者說。