Deer, Elk, Moose (?) Grow and then shed antlers each year. Each successive year the animal grows a more impressive rack. No hard and fast rule, but about one additional tine on each side per year.
What is the mechanism that causes the antlers to re-grow larger with more forks each time? Or put another way, how do the antlers “remember” how they grew last year, and thus “know” to grow bigger this year?