Now that Billy is infertile, I'm starting to bond him with Poppy. They make a lot of noises and I found out their meanings using this site: Guinea Pig Sounds It seems like they do a mixture of rumbling, chuting and teeth chattering? I don't really know what this means... I have them to together for about an hour at a time, then they go into separate pens next to each other. Should I just continue this until they settle down more?