Red squirrel
From Tardis Wiki, the free Doctor Who reference
Red squirrels were a type of squirrel found at least in England. In November 1605, the First Doctor and Robert Cecil accidentally startled a red squirrel while searching the Privy Garden of the Palace of Westminster. (PROSE: The Plotters [+]Loading...["The Plotters (novel)"])
The Ninth Doctor noted that grey squirrels carried a pox which was deadly to their tufty "cousins"; the greys were immune, but the reds were not. As a result, red squirrels were not likely to be seen in England in the 2000s; indeed, Rose Tyler, had never seen a red squirrel when the Doctor compared the pox to the Raldoma Syndrome carried by Horlak's tribe of Silurians. (COMIC: The Lost Dimension [+]Loading...["The Lost Dimension (comic story)"])
