The forest can be a cold and unforgiving wilderness, so it's nice to have a friend, whatever species they are.
The BBC writes,
"A young red deer has joined a flock of sheep on the Suffolk coast and seems to have been adopted. The deer appears to have lost his herd and joined 100 sheep, which graze on National Trust land at Dunwich Heath and Orford Ness in Suffolk. Andrew Capell, the flock's shepherd, said: 'They seem to have accepted him as one of their own.'"
Now that is some real life interspecies love!