thumb|A squitten with the genetic deformity radial [[hypoplasia, showing twisted forelimbs]]
"Squitten" is a term used for a domestic cat with a genetic deformity which causes only partial formation or the complete absence of the radius bone, making the cat resemble a squirrel. The word is a portmanteau of squirrel and kitten. Also rarely used is the term "kangaroo cat", which derives from a 1953 specimen known as the Stalingrad Kangaroo Cat. Veterinarians recommend that cats with these congenital disorders be kept indoors and monitored by specialists, since long-term management of the condition is essential for their quality of life. X-rays can determine the structure of the extra toes and whether the cat has the gene for RH.
A corresponding condition affecting the hind legs is called femoral hypoplasia and has only been reported three times in cats.
Treatment
If diagnosed early, splinting can help realign the limb closer to its normal anatomical position and prevent complications such as ulna fractures, joint contractures, and muscle wasting.
The exact cause of these congenital disorders remains unclear, but evidence suggests a genetic basis. For this reason, breeding affected animals is not recommended. Under this convention breeding is effectively banned in the European Union: