Do I look fearsomely scary in the photo above? I should! That is my snarl. Coral took this photo of me when she was staying with us. I used this face on her all the time trying to scare her away. Eventually, it worked, although it did take much longer than I was expecting.
I think part of the reason my snarl doesn’t scare people is because I also make this face when I am happy or playing. We capybaras don’t have a lot of diversity in facial expressions so each one has to serve multiple functions.