My Guinea Pigs once made a sound that sounded almost exactly like a bird chirping. What does this mean?
It's a very rare sound made by guineapigs. It also known as "singing". Nobody knows for sure what it means, but it's definitely a good thing. It's usually made when the guinea pig is very happy and comfortable. :)
Could be accedental
They ate a bird.
I would take it on the road and get my 15 minutes of fame. Maybe even on the Ellen Degeneres show.
It means that they are very happy
It's normal don't worry.