how many birds are in 12 days of christmas

The "12 Days of Christmas" is a Christmas song that consists of 12 consecutive verses, each describing a gift given on one of the 12 days. In total, there are 24 birds in the song. There are 1 partridge in a pear tree, 2 turtle doves, 3 French hens, 4 calling birds, 5 golden rings, 6 geese a-laying, 7 swans a-swimming, 8 maids a-milking, 9 ladies dancing, 10 lords a-leaping, 11 pipers piping, and