Convergent evolution
Vultures of the Old and New Worlds come from separate, though related families. Old World vultures come from the family Accipitridae, which also includes eagles, kites, buzzards, and hawks. Old World vultures find carcasses exclusively by sight. New World vultures belong in the family Cathartidae, and use scent as well as sight. They are both large, soaring birds which are specialist feeders on dead carcasses. They have powerful beaks, long featherless necks, strong stomach acids, an extensive crop to store the food while eating, and so on. These traits have evolved independently.