![A deer in its second year, a yearling, is caught by the lens of a wildlife camera. His small rack of antlers has grown over the past year. Antlers have the fastest growing tissue known to man. With the right nutrition, a buck can grow an excess of 200 inches of bone on his head in a matter of 120 days.](https://secure.caes.uga.edu/news/multimedia/images/2674/VelvetBuckLR.jpg)
Deer Rut
Once again, it is that time of year when bucks start chasing does, and deer hunters hit the woods. You guessed it: It is time for the rut, or breeding, season. But the question to be answered is, “How do biologists predict when the rut is going to be?”