Chesty often calls--but we're never sure who he's calling. He usually does it when he leaves the room we're in. It just occurred to me that maybe he's calling us to follow, but our original theory is that he had a friend in his first home that he's looking for now. He would walk around the house, calling curiously but also a little sadly, as he pawed at all the doors. He was adopted from the SPCA where we got him, then returned--they don't know why, or any of his history. Anyway, he called a LOT when we first got him, but that has decreased as he's become more comfortable with us. His call sounds so un-catlike that we think he may have had a dog friend before--he almost sounds like he's trying to bark or whine like a dog!
He's the most talkative of my three cats. He often gives a little rolling chirp when he jumps up on the bed or the couch, or when he approaches one of the others, hoping to play. Eva meows when I'm in the kitchen and taking too long to fix their dinner: "Me first!" Ziv hardly talks at all, except when he's in the car. Then he just cries.