The whiskers on the left side are just nubs -- a few on the right are missing too.
I'm not entirely sure who the whisker nibbler is, but I think it might be Dinah. I didn't see her actually chewing on Tegan's whiskers, but I did notice her licking her face quite aggressively as they were settling into a puddle and getting ready for a nap.
Tegan is the smallest of the set, and often it's the wee one that this happens to.
Don't look so sad, wee Tegan. They'll grow back, I promise!
And with or without them, you're still the most adorable thing in the world.