Robin

In English folklore the robin is sometimes associated with both good and bad luck, and both life and death. A robin pecking at your windows or entering your house is said to bring death to the owner, and as far back as the 16th century it was said that if a robin found the body of a dead person it would cover the body with moss, leaves and flowers.


"Hurt a robin or a wran,
Never prosper, boy or man".


The above rhyme points to the belief that to hurt or injure a robin will surely bring the person much bad luck. Sources speak of cows giving bloody milk and buildings burning down all brought on by the bad luck associated with robins.


http://englishheathenism.homestead.com/folklore.html