Mammoth

Mammoths were a species of proboscidean mammal native to Earth in humanity's prehistory. They evolved from elephants which migrated from Africa to the north and adapted to Europe, Northern Asia including Russia, and North America in the Ice Age.

Human prehistory
Around 100,000 BC, Martha Jones watched herds of mammoths while the Tenth Doctor went to retrieve the bodies of Modrikanians who had died in a crash on Earth. (PROSE: Snowglobe 7)

Nimrod's Neanderthal tribe herded mammoths "sunward to find new grazing." (TV: Ghost Light) According to the Fourth Doctor, the Neanderthals could knock up a good Mammoth casserole. (PROSE: The Romance of Crime)

While being pursued by the Trods through time, the Second Doctor visited prehistoric Earth, where he used his recorder to befriend a herd of mammoths and get them to destroy the Trods' power supply. (COMIC: Pursued by the Trods)

The Ninth Doctor and Rose Tyler on a visit to prehistoric Earth encountered a mammoth killed by a Hy-Bractor. (PROSE: Only Human)

After being flung back in time by a Time Cube, the Fourth Doctor, Sarah Jane Smith and Dr. Bhoul encountered a caveman and a raging mammoth. (PROSE: The Time Snatch)

Circa 35,000 years ago, the Eleventh Doctor and Rory Williams visit the future site of Los Angeles, California, where the TARDIS becomes stuck in a tar pit. A mammoth was also stuck in the tar pit with them. (COMIC: The Doctor and the Nurse)

There was a picture of a mammoth in Malohkeh's database. (TV: Cold Blood)

Modern times
King George III of the United Kingdom received the last mammoth in Europe as a gift from Catherine II of Russia. (PROSE: Grass, The Adventuress of Henrietta Street, The Book of the War, COMIC: Political Animals) In 1782, during a night of drinking with the Eighth Doctor, Scarlette claimed that she had once ridden George III's mammoth. (PROSE: The Adventuress of Henrietta Street) As late as 1804, Thomas Jefferson believed that woolly mammoths still roamed the North American midwest and even sent an expedition to find one. (PROSE: Grass, The Adventuress of Henrietta Street)

In 1894, a spaceship containing temporal radiation exploded near the London Zoo, devolving one of its elephants to a mammoth. (PROSE: The Evolution Episode)

When Professor Grisenko discovered Skaldak encased in ice in 1983, he thought that he was a mammoth. (TV: Cold War)

In 2010, woolly mammoths were some of the prehistoric creatures brought into Sydney by chronal waves caused by the SKARDIS. (COMIC: The Age of Ice) In the same year, the Eleventh Doctor and Amy Pond encountered an alien spaceship disguised as a mammoth in New York City. (PROSE: The Forgotten Army)

Alternate timelines
In an alternate timeline, the Silurians brought back the mammoths, raising them for food and allowing them to roam the mountains of Earth. (PROSE: Blood Heat)

In another alternate timeline, an American news anchor told her audience that the Holy Roman Emperor Winston Churchill had a "personal mammoth", and that he returned to the Buckingham Senate atop it. (TV: The Wedding of River Song)

Other planets
A zoo on an Earth-like planet exhibited a mammoth or a mammoth-like creature. (COMIC: The Didus Expedition)

The Junlangis of Dellah were white, mammoth-like creatures. (PROSE: Twilight of the Gods) Yahoomer's species resembled orange mammoths with four trunks. (PROSE: The Monsters Inside)

K9 once encountered some mammoths on an unnamed planet in another dimension, partially inhabited by ex-Tellac miners. They lived alongside other Earth animals from widely varying periods of evolutionary history. On this planet, he observed one fighting a sabre-toothed tiger. (PROSE: K9 and the Missing Planet)

Due to a fracture in time caused by the Time War, mammoths on Traxis coexisted with dinosaurs, neanderthals and robots. (COMIC: Weapons of Past Destruction)