Hi, my friend has a guinea pig and she filmed it on her mobile for me and i noticed some things i would like to understand 
So my questions is in the video, when she touches the female guinea pigs behind area she makes like a different noise. Why is that?
Second question is, why is her legs or arms in different colors? I mean her front paws are like the same color as her pur, but the back legs are like there is no hair there at all? How so?
I'm asking this cause I'm curious how they work and that
And i think they are so cute

So my questions is in the video, when she touches the female guinea pigs behind area she makes like a different noise. Why is that?

Second question is, why is her legs or arms in different colors? I mean her front paws are like the same color as her pur, but the back legs are like there is no hair there at all? How so?
I'm asking this cause I'm curious how they work and that

