Siamese
The Siamese cat is a distinct breed with a temperature-sensitive coat, blue almond eyes, and a history tracing back to 19th-century Siam, alongside health specifics and breed variations.
The Siamese is a distinct domestic cat breed originating from Thailand, selectively bred since the late 19th century from the Wichianmat landrace. Its defining traits are a temperature-sensitive coat pattern, blue almond-shaped eyes, and a slender, muscular body, though the breed has split into modern and traditional styles.
The history of the breed is rooted in the ancient manuscripts of the Ayutthaya Kingdom, where the Wichianmat cat was described as rare as gold. While Western fanciers developed the breed into a global phenomenon, the specific genetic mechanisms behind its appearance and the split between the modern show cat and the traditional Thai cat are matters of documented history and selective breeding.
History from Siam to the West
The breed traces its lineage to the Wichianmat landrace cats of Siam, depicted in the Tamra Maew (The Cat-Book Poems), a collection of manuscripts dating from the 14th to the 18th century. These texts described the cats as being as rare as gold, and a legend from the 1767 Burmese–Siamese war suggests that King Hsinbyushin of Burma ordered the capture of these animals as treasures.
The first documented arrival in the United States occurred in 1878, when US President Rutherford B. Hayes received a cat named "Siam" from Bangkok. In Britain, the breed's foundation was established in 1884 when Edward Blencowe Gould imported a breeding pair, Pho and Mia, to his sister. Their offspring, including Duen Ngai and Kalohom, were shown at the London Crystal Palace in 1885, attracting significant attention despite the high mortality rate of the kittens.
Modern versus traditional body types
The breed underwent a dramatic physical transformation in the mid-20th century, shifting from a stockier, rounded appearance to an extremely elongated and angular form. By the 1950s and 1960s, breeders favored a slender, tubular body with a long, thin tail and a wedge-shaped head, creating the modern show Siamese that is widely recognized today.
This divergence led to a formal split in the 1980s. The "old-style" cats, which retained the rounder head and stockier build, were re-established as a separate breed known as the Thai cat. While both the modern Siamese and the Thai cat descend from the same distant Wichianmat ancestors, they now have few recent ancestors in common and are effectively distinct sub-breeds with different breed standards.
The science of the colourpoint coat
The Siamese coat pattern is a result of a mutation in the tyrosinase enzyme, which is heat-sensitive and responsible for melanin production. This enzyme fails to function at normal body temperatures but becomes active in cooler areas of the skin, typically below 33 °C, resulting in dark coloration on the extremities and face.
Kittens are born cream to white because their body temperature is uniform; they develop visible points in the first few months as the cooler parts of their body become active. The intensity of the coat can vary with age and climate, with adult Siamese in warm environments often having lighter coats than those in cooler regions. Originally, only black points were accepted for showing, but breeders have since expanded the palette to include blue, chocolate, lilac, cinnamon, fawn, red, cream, and caramel.
Health and neurological factors
The same genetic mutation that creates the colourpoint pattern also affects the nervous system, specifically the optic chiasm. This results in abnormal uncrossed wiring between the eye and the brain, a condition that historically caused many Siamese to be cross-eyed, though selective breeding has largely eliminated this trait.
Health data indicates that Siamese cats have a higher mortality rate than other breeds, with Swedish insurance data showing that 68% live to 10 years or more. The primary causes of death are neoplasms, particularly mammary tumours, and the breed also faces a higher risk of gastrointestinal problems. However, they have a lower risk of feline lower urinary tract disease compared to the general population, and unlike many other blue-eyed white cats, they do not suffer from reduced hearing ability.
Behaviour and temperament
Siamese cats are renowned for their social nature and intelligence, often described as extroverts that bond strongly with a single person. They tend to be more diurnal than other breeds, staying close to their owners and engaging in more interaction rather than hunting.
This high level of engagement makes them distinct from many other domestic cats, as they are less likely to hunt and more likely to participate in the daily activities of their household. Their affectionate and vocal nature means they generally prefer the company of people and other animals over solitude.
The Siamese cat remains a unique breed defined by its specific genetic traits, a rich history spanning centuries, and a distinct split between its modern and traditional forms. While the modern show cat is instantly recognizable by its extreme angularity, the breed's core characteristics and health profile remain consistent with its origins in Thailand.