Simplify the following text for a Grade 3 native English-speaking person.
Original: Partridges are famously featured in the Christmas carol `` The 12 Days of Christmas '' , where they appear in the line , `` A partridge in a pear tree . ''
Simplified: Partridges are in the song `` The Twelve Days of Christmas '' . The line '' ... and a Partridge in a pear tree '' is sung .