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Reindeer (Caribou) 
Even though no one has actually seen a reindeer fly, this special member of the deer family has a lot to live up to! Reindeer and caribou are classified as the same genus and species, (Rangifer tarandus). In Europe, they are called reindeer. In North America, we typically use the name reindeer when we refer to Eurasian populations, and the name caribou to refer to most populations in North America. However, we use "reindeer" to refer to domesticated individuals, even those in North America.
Antlers are the reindeer’s most memorable characteristic. In comparison to body size, reindeer have the largest and heaviest antlers of all living deer species. A male’s antlers can measure up to 51 inches (130 centimeters) long, and a female’s antlers can reach 20 inches (50 centimeters). Just as a tree has a trunk, so all antlers have a main beam and several branches or tines that grow from the frontal bones of the skull. Unlike horns, antlers fall off and grow back larger every year. As new antlers grow, the reindeer is said to be in velvet, because skin, blood vessels, and soft fur cover the developing antlers. When the velvet dries up, the reindeer rubs it off against rocks or trees, revealing the hardened, bony core. This time of year - you may just see them on your roof :-)
Have a great week!