We have two guinea pigs:

Daisy:

Rose:

A couple things:

1. Guinea pigs are probably one of the most fragile pets you can have. They are instinctively afraid of just about everything for good reason (just about everything they might encounter could eat them, including people). Despite that they have no qualms about yelling at the two giants they live with whenever they feel they aren't getting enough treats.

2. They are smarter than I knew. I taught them a simple trick. They turn in a circle whenever they get a treat. It took them about 1 week to get the idea, and then they immediately turned the tables on me by making circles whenever they wanted more treats. It is almost painfully adorable.

3. They are litter trained. They have trays they go into to pee, and when you are holding them, they will let you know when they need to go back to pee.

Daisy will sit with you for up to an hour and won't pee on you, despite the fact that guinea pigs are said to have to go about every 15 minutes. When she needs to go, she'll start to quietly wheek to let you know.

When you hold Rose, she will immediately lay down and go to sleep as shown above. She can't hold it as long as Daisy, so when she wakes from her nap, she'll need to go right back. She'll take your shirt in her mouth and tug on it to let you know she needs to go.

4. When they are happy, guinea pigs do something called "popcorning". They literally jump for joy almost uncontrollably when they are delighted by something. It's one of the most amazing things to see. Such an immediate and rewarding confirmation that you've done something right. They will literally jump up on the air with all four feet off the floor. When we put them in their playpen, they'll run around doing zoomies and jumping in the air as they go.