Thanks!! The name Zanzibar came to me in a dream I had shortly before we got him. In it, a young man is riding a bicycle and his name is Zanzibar Bast. I knew Bast was the Egyptian cat goddess, so I decided to give him that name.

Animals, I believe, have extremely sensitive energy fields when they're alive. So your cats may very well have "heard" your calls on an energetic level. And I believe their spirits remain close by when they transition.