Tiger

Tigers were large predatory cats. They died out on Earth in 2148. (PROSE: St Anthony's Fire)

Earth tigers
The Tribe of Gum had to defend themselves from tigers, amongst other animals. (TV: An Unearthly Child)

In 120 AD, the Tenth Doctor found himself opposing lions, tigers and bears in the Flavian Amphitheatre. At one point, a tiger ran towards him, but he neatly jumped over it, and the tiger went on to maul its trainers, who had badly mistreated it. (PROSE: The Stone Rose)

Among the prizes that the First Doctor obtained during a game of backgammon against Kublai Khan in 1289 were twenty-five tigers. (TV: Marco Polo)

In England in the 1920s, Nyssa and Tegan Jovanka were cornered by a tiger in a fairground menagerie but managed to escape unharmed. (AUDIO: Smoke and Mirrors)

In New York City in the 1960s, tigers were among the zoo animals released by a mad scientist. (COMIC: The Monsters from the Past)

In November 1988, when the Seventh Doctor and Ace visited Windsor Castle, there was a stuffed tiger head in the basement. (TV: Silver Nemesis)

The zoo that Martha Jones visited when she was young had a tiger that always slept. (PROSE: The Last Dodo)

A tiger escaped from London Zoo in the early 21st century after a global forest grew overnight. It was preparing to attack Clara Oswald and Maebh Arden, before it was scared away by Danny Pink. (TV: In the Forest of the Night)

Tigers went extinct before 2148, though their bones were sometimes preserved and saved. (PROSE: St Anthony's Fire)

A tiger was one of the animals on board the Ark in circa 10,000,000. The First Doctor, Steven Taylor and Dodo Chaplet encountered it, and were surprised to find that it was not aggressive. (PROSE: The Ark)

Breeds
Amongst the known breeds of tiger on Earth were sabre-toothed tigers (which became extinct in circa 9000 BC), Siberian tigers, Malayan tigers, and Bengal tigers. (PROSE: The Eight Doctors, PROSE: The Last Dodo, PROSE: Pack Animals)

Extra-terrestrial tigers
Despite similar appearances, the tigers of Earth were unrelated to the Hitchemus Tigers. (PROSE: The Year of Intelligent Tigers)

There were at least two species of shapeshifting tiger-like species: an unnamed species (PROSE: Old Flames) and the Tygers (PROSE: The Eye of the Tyger). Gideon changed into a Tiger-like Humanoid. (COMIC: Universal Monsters)