We met this cockatoo, Chester, while at the last club meeting. He was very friendly and lots of fun. But the owner wasn't sure what type he was. She thought originally that he was a Lesser Sulfur Crested cockatoo but the pictures shes seen of those usually don't have such bright yellow check patches. I have to admit I find the whole Sulfur Crested family a bit confusing. What distinguishes the Lesser/Medium/Triton/Greater from each other. I've never met a Greater but I have met 2 Triton and they both were awesome. As I understand it Tritons are a subspecies of the GS2s but the owners of the first T2 I met were made a big deal that a T2 was not the same species as a GS2. But then again they would not believe me when I told them that petting him under the wings was a bad idea. Actually they pet him all over. I tried to explain to him what it would do to their T2 but they wouldn't believe me. They breed small birds and have 20 + parrots and thusly are experts compared to me. The T2 is only 2 (now 3) so it is nowhere near sexual maturity but I worry about its future.