How can you tell if a rat is smiling?

What does a rat “smile” look like, you ask? Well, these scientists asked the same question, and answered it by taking pictures of rats being tickled, and comparing the images of happy rats to those taken while blasting them with white noise. It turns out that the rat equivalent of a happy grin is slightly pinker, and more relaxed ears. How cute is that?

Facial Indicators of Positive Emotions in Rats.

“Until recently, research in animal welfare science has mainly focused on negative exp

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