2.1 Animal trapping
The animal samples of Chinese mole shrew were trapped from four seasons (Jan, Apr, Jul and Oct) from 2018 to 2019 in Pengzhou, Sichuan Province, southwest China. All collected specimens were identified based on external characteristics in the field and were further confirmed according to skull morphology in the laboratory. The animals were immediately frozen at −20°C for further analyses. A total of seventy-two of Chinese mole shrew (18 in each season) were used in this study.