Orange and tortoiseshell house cats (torties) have long been an enigma for hair coloration in mammals: now, the genetic basis ...

While tortoiseshell coats are common in female cats, they're incredibly rare in males. Here's why this coat pattern is so hard to find - and so expensive.

A British veterinarian who adopted a tortoiseshell cat says it’s a freak of nature. Actually, Karen Horne, 38, says her cat is a genetic impossibility. The cat is male, and boy cats should be… ...

Veterinarians from the University of California, Davis, have discovered that cats with calico and tortoiseshell coat patterns tend to challenge their human companions more often than other kinds ...

Is your calico cantankerous or your tortie a tad touchy? Researchers at UC Davis Veterinary Medical Teaching Hospital say you aren’t imagining things. They are. The “cattitude” study ...

Even so, the tortoiseshell cat 's well-timed yowls are impossible not to laugh at. She knows exactly when her mom is talking to her (and laughing at her), and she doesn't like it one bit!

This “Tortie,” the nickname used for Tortoiseshell cats, lives up to the talkative reputation they have in the pet world.

Ember peers upwards as she sits on the floor at home. The tortoiseshell cat had a hilarious reaction to her owner's parents coming to stay, and it has now gone viral. Eric Janney "My parents came ...

Cats exhibit a wide range of behavior, from entitled to slightly less entitled. But some pet owners may have noticed that tortoiseshell-patterned or calico-patterned felines might demonstrate a ...

Unlike any other “ginger” mammals, orange cats’ coloration owes to a sex-linked gene, which is why 80% of orange felines are fellas.