what are the gifts on the 12 days of christmas

On the first day of Christmas, my true love gave to me: a partridge in a pear tree. On the second day of Christmas, my true love gave to me: two turtle doves and a partridge in a pear tree. On the third day of Christmas, my true love gave to me: three French hens, two turtle doves, and a partridge in a pear tree. On the fourth day of Christmas, my true love gave to me: four calling birds, three French hens, two turtle doves, and a partridge in a pear tree.