Loner Sparrow

Question
Amongst the many house sparrows, there is one who stays by himself, visits alone and is less nervous and afraid of myself and my two dogs. Wondering why or what may make him different. Thanks!

Answer
In any group of animals, (birds, fish, antelope, etc.) there is often one individual who doesn't hang out with the group. Unless you have studied the group for awhile, there is no way to tell why. Could be the bird is injured, has a mental defect, has a genetic defect, is a lot order or younger than the group, etc. Keep watching and you might come up with an answer.