Panther

Panthers are fast, intelligent animals in the world of Narnia. They are described to be black colored and they are very loyal to Aslan.

In The Magician's Nephew, panthers were among the animals that chased Uncle Andrew after Aslan created Narnia.

In The Horse and His Boy, some panthers fought in the Battle of Anvard against the Calormenes. They proved valuable in the battle, scaring the Calormene horses.

Film
In the 2008 film Prince Caspian, many panthers were seen with the Old Narnians, where they become loyal to Caspian X and they fight at the Telmarine Castle Night Raid and the Second Battle of Beruna against the Telmarine army. The panthers even took part in the Second Battle of Beruna.

Trivia

 * A black panther is typically a melanistic colour variant of any of several species of larger cat. (black Jaguars, black Leopards, possibly the very rare black tigers, or possibly black cougars)