I started out with only two, and that was fine. We went along happily for a year, but when I saw how attached they were to each other, I started to worry about losing one, and having the other be too lonely. Then a friend found a stray hen that no one claimed, and I took her. After one month quarantine (and blood tests) I slowly introduced her, and had a happy trio, for another two years. Then I lost one of my original two this summer, and I was so glad my Harper still had a friend. Then I got three more pullets, because, well, can't have just two now, and chicken math.