For the first bear, use "wasd". For the second bear, use arrows key.
The first bear is the father bear which he dies first. The second bear is the mother bear which she dies after the father bear. The last three are baby bears who will continue to chomp on many deer. You will see that at first sight, the herds of deer will not die out yet since its only 1 bear, but soon, you will see that the deer will begin to die quicker due to the family bear(5 bears). Eventually, the once many herds deer will become nothing but food for the bear.