Four Colly Birds?

Well, how about that…

The fourth day’s gift is often stated as four “calling” birds but originally was four “colly” birds, this being another word for a blackbird. The fifth day’s gift of gold rings refers not to jewelry but to ring-necked birds such as the ring-necked pheasant or to “five goldspinks” — a goldspink being an old name for a Goldfinch. (Wikipedia)

Birds make great gifts!