The mother is there from the time the calf is born. Helping to locate and eat food, providing safety from predators. Helping to get you through the first winter. Helping to survive all the challenges nature and at times human throw at the calf. Then just as the calf starts getting closer to being a year old, the mother turns on her calf. Becoming aggressive and starts charging, trying to drive the calf away. The mother is pregnant and needs all her energy to look after the new calf that will be born soon. After several days of pushing, this calf moved on.