This undated photo provided by the Center of Natural Sciences in Prato, Italy, Wednesday, June 11, 2008, shows a deer with a single “horn” (really an antler) in the center of its head. The one-year-old Roe Deer – nicknamed “Unicorn” – was born in captivity in the research center’s park in the Tuscan town of Prato, near Florence, Gilberto Tozzi, director of the Center of Natural Sciences, said. He is believed to have been born with a genetic flaw; his twin has two antlers. (AP Photo/Center of Natural Sciences)

For more on this breaking story, see here and here.

Thanks to Jacob Covey and Aztec Raptor for the, well, heads up on this one!

This apparently is an European roe deer (Capreolus capreolus), which have antlers.

Antlers vs Horns

Antlers are made of bone
Antlers grow each year and then fall off.
Moose, elk, and deer have antlers.
Horns are not bone.
Horns don’t fall off each year.
Bison, sheep, goats, and cows have horns.

~ John Wiessinger, 2001.

BTW, antelopes have horns, as do rhinos.