When a bird loves a bird he can Twitter.
6 seconds sound clip from the Fun and Fancy Free movie soundboard.
You can hear this line at 00:29:49 in the Blu-ray version of the movie.
Quote context
[...]
- When a bird loves a bird he can Twitter.
- When a puppy falls in love he can yap.
- Every pigeon likes to coo when he says I love you, but a bear likes to say it with a slap.
- When a whippoorwill's in love he can whipper.
- All the horses neck and all the turtles snap.
- Every deer and every dove has a way of makin' love, but a bear likes to say it with a slap.
[...]