My sweet first guinea pigs Chico and Amigo...I got them in July 2020 from an animal shelter. Recently, Chico has FINALLY let me pet his little head. Amigo has been letting me pet him for around a year now, but Chico has never liked it. Now when he lets me, he will stay still and enjoy it. And just today I finally saw Amigo popcorn! He and Chico are always making noise, so I was surprised to see Amigo doing little jumps in the hay pile along with the normal chatter. I just always assumed they were never much into doing it, especially compared to my youngest Maple Leaf who does it several times a day. It's always exciting when they start doing new/normal things but sad when I think about how long it's taken.