structural:scholar_edition, structural:summarization
Traditional Siamese versus modern development

In the 1950s–1960s, as the Siamese was increasing in popularity, many breeders and cat show judges began to favour the more slender look. As a result of generations of selective breeding, they created increasingly long, fine-boned, narrow-headed cats. Eventually, the modern show Siamese was bred to be extremely elongated, with a lean, tubular body, long, slender legs, a very long, very thin tail that tapers gradually into a point, and a long, wedge-shaped head topped by extremely large, wide-set ears.

By the mid-1980s, cats of the original style had largely disappeared from cat shows. Still, a few breeders, particularly in the UK, continued to breed and register them, resulting in today's two types of Siamese: the modern, "show-style", standardised Siamese, and the "Traditional Siamese", both descended from the same distant ancestors, but with few or no recent ancestors in common, and effectively forming distinct sub-breeds, with some pressure to separate them.

In addition to the modern Siamese breed category, The International Cat Association (TICA) and the World Cat Federation (WCF) now accept Siamese cats of the less extreme type, and any wichianmat cat imported directly from Thailand, under the new breed name Thai. Other, mostly unofficial, names for the traditional variety are "Old-style Siamese" and "Classic Siamese", with an American variation nicknamed "Applehead" (originally a derogatory nickname due to its extremely rounded features compared to what had become show breed standard Siamese).