The Kingfisher bird does not conventionally sing but makes a different sound that is a rattling squall. There is sound clips at the following website:
http://www.allaboutbirds.org/guide/Belted_Kingfisher/lifehistory
Yes, a bird will usually sing when it hears another bird. We have a parakeet and when we whistle she answers.
a bird (a feathered animal with wings)
show territorial ownership,mate attraction.
The bird who sings is the COCKSWALLOW
Jailbird