Small growls and large growls
本文作者： 21ST
A DOG is able to tell how big another dog is just by listening to its growl (咆哮), a new study has found.Scientists studied dogs of different breeds (品种) and ages. One group of 24 dogs was shown two images on a screen, one of a large dog, the other a small one. |  |
| |||||||||||||||||||||||||||||||
京公网安备 11010502033664号