Is This A Sign Of Bad Luck Or Good Luck?

So Every Day There Is This Black Bird That always Flies To My Window and He Comes In The Morning and In The Afternoon , and he always keeps Coming back each time and he chirps Way To Much ... When i Was Looking out the window today he was their chirping and i finally noticed the bird is missing a leg and he only has one ! People Say if You See a Black Bird Its Bad Luck , Well I Keep Seeing a Black Bird Every single Day Of The 365 days of the Year ! so Could this possibly be Bad Luck or Good Luck or is this bird trying to tell me something i need to Know As Soon As Possible ...... ?