White-tailed Deer
Odocoileus virginianus

1/640s at f5, ISO:800, Nikon D300S w 300mm

"White-tailed Deer." Wikipedia, the free encyclopedia. Males re-grow their antlers every year. About 1 in 10,000 females also have antlers, although this is usually associated with hermaphroditism. Bucks without branching antlers are often termed "Spikehorn", "spiked bucks" or "spike bucks". The spikes can be quite long or very short. Length and branching of antlers is determined by nutrition, age, and genetics. Rack growth tends to be very important from late spring till about a month before velvet sheds.
Canadian Rocky Mountains