The dog and owner were played dog growls while images of a large and small dog were projected onto the screen. The experiment was recorded with video cameras.

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Dogs are able to tell how big another dog is just by listening to its growl, a new study has found.

Scientists studied 96 different dogs from a variety of breeds and ages. One group of 24 dogs were shown two images projected onto a screen, one of a large dog, the other a small one.

The dogs were then played the recording of growl from either small or large dog which came from between the two images. The dogs were filmed to see which of the images they looked at first and for longest. ...（點擊《每日郵報》查看原文）

狗狗能靠同類吠叫判斷對方身型

???????據《每日郵報》稱，一份新的科學研究發現，狗可以通過聽同類的吠叫就能判斷出對方的身型大小。

???????科學家總共研究了96條不同品種和年齡的狗。譬如，他們給其中一組24條狗投影了兩種剪影，一個剪影是大狗，一個剪影是小狗。

???????然后他們給這些狗分別播放了大狗和小狗的吠叫。他們拍下了這群狗在聽到某一種吠叫后，首先盯著哪個剪影看，以及盯著哪個剪影的時間最長。

???????近日他們把研究結果發表在了PLoS ONE網絡日志上。結果表明，24條狗中，有20條都能根據犬吠聲，首先盯住正確身形大小的剪影看，并盯的時間最長。

???????這群匈牙利布達佩斯特埃奧特沃斯-羅隆德大學的研究者們研究的是狗會用特別的吠聲來保護他們的食物。最新的研究結果也表明，狗一般不會隱瞞它們的身形大小。