Why does the bleeding heart pigeon have that red marking?

I went to the local wildlife sanctuary recently and I saw the bleeding heart pigeon. It's really pretty but I want to know how or why nature gave it that kind of marking. If anyone has a good opinion on this, I'd like to hear about it.

Why does the bleeding heart pigeon have that red marking?
Probably a sexual ornament, to attract females (or males i guess if it's on both sexes). Like a peacock tail, or a turkey neck, or big full human breasts.





Darwin once thought there was no way to explain ornaments like this, but there are now two competing evolutionary theories on the purpose these ornaments serve:





1. "Specific mate recognition system" in this case it helps them find other bleeding eart pidgions, because if they seduced and mated with any old pidgion they would not produce babys and therefor from a perpetuation-of-their genes point-of-view it would be a waste of time.





2. "condition dependant display trait" so in this case only strong healthy birds will have a nice neat bright red spot, and therefor they are chosen as mates, so the spot is "selected" for.





That's the short version of the story, but if you google the names of those two theories you will probably find something interesting. Also it is very general, so you may want a more specific opinion on this particular bird.
Reply:It is for males to attract mates. They display their red chests prominently during mating season.
Reply:bright colored animals are usually the male sex of the species so that the females can identify them when they are ready to mate, it's called sexual dimorphism.