What a warm herd of deer the young deer are together in the snow season

There is a rare deer species in a nature reserve in Alaska, the owner killed all wild animals such as leopards and wolves to protect the deer. Since then, deer have been placed in a "happy nest", and their physique has become weaker and weaker. Later, the owner introduced wolves, and the deer's physique and vitality gradually strengthened. The change of deer's survival ability is reflecting an important topic in today's society: competition is the driving force for development.