Why do the chew on hair?

[Twinkle_Toes]

We have three Guinea Pigs. Our two females (Twinkle Toes - aged 10 weeks and Matilda - 14 months) stay together and our male (Rodney's almost 4 months) is in a cage right beside the girls. They can touch thru the cages and the male will chew the babies fur every chance he gets. The baby, Twinkle toes, has longer fur then Matilda, he doesn't chew on Matilda's hair. Is this due to a vitamin defeciency, boredom or something else?
They get a varied diet, pellets, hay, fruits, veggies. They have toys, tubes, ramps, and boxes to play in and with.
Is there a cause for this behavour?

 

[Starbucks]

thats called barbering, for obvious reasons. some people say its a sign of aggression, and others will say its just out of pure bordem. make sure the piggies have plenty of toys to play with and lots of fresh hay to chew on. then see if the helps the problem.

 

[Treen]

There are a few theories - boredom, dominance or some kind of nutritional deficiency. I don't think there's one agreed cause! It's possible Rodney is doing it because he'd like to get in with the girls.

As long as they have plently of space, a good diet and a stimulating environment, I guess you just call it 'one of those things...'!