Dr Jhala and colleagues assessed their method by collecting paw prints and faeces at 21 forest sites in central and northern India.
Jhala博士和同事们通过在印度中部和北部的21座森林里收集脚印和粪便来评估他们的方法。
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Dr Yadvendradev Jhala of the Wildlife Institute of India, who led the study, said: "Tigers are cryptic, nocturnal and occur at low densities so they are extremely difficult to monitor.