I did a research essay about them for school and the polls said that there were fewer than 1000 breeding pairs left. Even though they aren't the first choice if you want clam, docile, chickens that lay large eggs, they do make very fascinating active pets. There is almost never a dull moment in my flock because of one SSH hen I had the fortune to get for free. She will not hesitate to put my roo to shame, even though he's much larger than she is. I think that because I have larger hens like the Barred Rock, Buff Orpington, she is more docile than what the "breed description" says.
Needless to say, she has inspired me to keep this species of chicken. I have recently bought seven more SSH. 2 roos and 5 hens.