[quote=Aragorn]
Reminds me of my parakeets. Most species of bird are super social, especially the small ones. I'll be eating breakfast and watching them squeezing and doing the burst equivalent of hugging/ kissing. There's three of them in the same cage btw.
[/quote]

Rats are very social too! They've been grooming each other all morning, and are visibly anxious when I separate them. Within a few minutes after their wrestling/fighting, they're curled up with each other napping.