Duncan
After adopting Arthur, and Winnie had made it clear that she wanted no friendships with any other creature bearing fur, we could tell Arthur needed ferret company to be truly happy. Winnie's constant rejections were hard on them both, so I started looking on Petfinder for one more weasely member of the family.
A local foster family had a few ferrets to choose from, but Duncan was the one we went to see and the one we came home with. He was so good with his foster brothers and sisters, and seemed sincerely ferret-friendly, only wanted to cuddle them.
He and Arthur have become fast friends. They play together and seek each other out for sleepy ferret piles. Sometimes both of them manage to shove themselves into one, superheated, ferret-filled hammock. Duncan loves treats, chasing the cat, squeaking like a little rusty squeeze box and running full speed under the couch with his Snoopy.