When I learned the Twelve Days of Christmas, I sand, "On the Fourth Day of Christmas my true love gave to me, Four Colly Birds....." Colly is an old expression for Calling Birds.
It doesn't matter what they're named because it's the color that's important. These birds are black. Black symbolizes death.
Death? Yes because today is the Feast of the Holy Innocents, December 28. The day we remember all the babies slain on Herod's orders. Herod had heard that a new baby was born that was the true King. Herod was eliminating the competition.
Nowadays the Feast of the Holy Innocents commemorates all the innocent babies who have died in abortions.
The more things change, the more they stay the same.