About a decade ago we found an English Mulberry seedling and planted it on our lawn.  That once tiny tree now provides Mulberries for over a dozen bird species, squirrels, racoons, and who knows what else.  Mulberries start out green, then turn red, and when ripe are dark purple.  Best of all they do not all ripen at the same time.  We find the Mulberries quite bitter, but the wildlife loves them.