Reindeer

Biology
Reindeer are mammals with red-noses. They also have the ability to fly due to unknown reasons.

History
The Doctor landed the TARDIS on a snowy planet, perhaps Earth. They pulled the TARDIS out of the snow and into the sky. He later landed the TARDIS again and they merely stood around as he tried to dig it up.

Trivia
The exact canocity of the Reindeers are unknown, seeing as the idents are of debatable canocity.