When the little bluebird   Who has never said a word   Starts to sing spring   When the little bluebell   At the bottom of the dell   Starts to ring ding dong ding dong      When the little blue clerk   In the middle of his work   Starts a tune to the moon up above   It is nature that is all   Simply telling us to fall in love      And that's why birds do it, bees do it   Even educated fleas do it   Let's do it, let's fall in love      Cold Cape Cod clams, 'gainst their wish, do it   Even lazy jellyfish do it   Let's do it, let's fall in love      I've heard that lizards and frogs do it   Layin' on a rock   They say that roosters do it   With a doodle and cock      Some Argentines, without means do it   I hear even Boston beans do it   Let's do it, let's fall in love      When the little bluebird   Who has never said a word   Starts to sing spring, spring, spring   When the little bluebell   At the bottom of the dell   Starts to ring Ding ding ding      When the little blue clerk   In the middle of his work   Starts a tune      The most refined lady bugs do it   When a gentleman calls   Moths in your rugs they do it   What's the use of moth balls      The chimpanzees in the zoos do it,   Some courageous kangaroos do it   Let's do it, let's fall in love      I'm sure sometimes on the sly you do it   Maybe even you and I might do it   Let's do it, let's fall in love