Chewing off whiskers

Hello everyone! I have three females that I have been housing together for nearly 5 months. Its a mom and her two babies. In the last few weeks, I've noticed that both mom and babies' whiskers have been slowly getting shorter. I haven't caught them doing it, but I'm pretty sure they are chewing each others whiskers off. Its such a shame because they all had such beautiful whiskers before and now they look like an old grandpa's mustache! Short and stubble-y!

Now I've read about people...

Chewing off whiskers