I introduced a young guinea pig about 2-3 months old to a 6-8 month old guinea pig...I bought the 1st a week ago and it is still scared of me and its surroundings and i bought the other one today from the same petshop and i decided to introduce them right away because they are both related...but when i introduced them in a place where both have never been...the old one just started licking the young one....while the other one just stood still and vibrated like a cellphone....the older one basically licked everything especiaally the butt of the young one...but now that i placed them on the same cage they just went their separate way. any ideas what is going on?........................