Write the next sentence in the following story.

How to encourage doves to coo
Listen for the different dove calls.
If you have wild doves in your backyard or pet doves that you keep indoors, you may be able to differentiate some of the calls. Some of the calls are uttered by the male as part of the mating process, such as " coooooo-woo-woo-woo.
" Every type of dove has a unique call. Mourning doves have a sad, mournful call.