Sad sight

I drove to my old place and met with my friend and old neighbor. We inspected the whole area, the cleared aspen shoots, and the marked oaks. We counted that there must now be at least fifty young oaks on my one hectare of land, most of them brought by birds. 
This little oak is one of the seven that we grew from acorns and planted in a row at the edge of the open area below the house. Deers are sweet and pretty, but why did one of them chew and cut my little oak? Is it going to survive? Oh, dear. :-/