Sometimes, you can hear these collisions a mile or more away. Banging heads usually doesn't hurt the rams because they have a special skull with two layers. The outer layer acts like a helmet to protect the brain inside. Bighorn lambs are born in the spring. Usually, each ewe has only one lamb each year.
Twins are rare.
A newborn lamb weighs seven to 15 pounds. Before the lamb is even a day old, it can run-but not very fast. Soon, lambs begin to practice butting heads. In this game, one lamb gets on top of a boulder or little hill, and the others try to knock it off. Bighorns live mostly in high mountain meadows.