Sheep

Sheep keeping the south lawn in proper trim as part of (rather dubious) wartime cost reductions, circa 1919 (Library of Congress)

LONDON (Reuters) - Sheep have been trained to recognize the faces of celebrities, including former U.S. President Barack Obama, by University of Cambridge scientists who hope it may help with understanding neurodegenerative diseases. 

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     Thomas Jefferson was apparently the first  president to keep sheep at the White House. From the Thomas Jefferson Foundation website:

"By the spring of 1808, there were almost forty presidential sheep grazing on the square in front of the President's House.15 If it had been the year 2000, there would also have been a flock of lawsuits. Several unsuspecting pedestrians tried to take a short cut across the square, met the Shetland ram, and were vanquished in their encounter. One William Keough wrote Jefferson that "in Passing through the President's Square [I] was attacked and severely wounded and bruised by your excellency's ram—of which [I] lay ill for five or six weeks."16 Another of the ram's unfortunate victims, as we learn from the diary of Jefferson's friend Anna Maria Thornton, was "a fine little boy killed by the Ram that the president has."17 

    Thornton's diary is the only place that death is reported---and even in Jefferson's time you would think a little boy killed at the White House by a ram would have been literary fodder, so to speak, for the day's media, but there is no mention. 
     To jump on the far-right bandwagon for a few seconds: perhaps the Clinton's were responsible, and managed to hide the evidence of the murdering ram?