Because they would need to compete over resources.
I believe it is Primates.
The population of Green-feathered birds decreases due to prefer other colour of male birds.
<h3>Why the population of Green-feathered birds decreases?</h3>
Green-feathered birds are becoming less and less common because of the female bird that choses the blue and red colour male for mating instead of green so that's why the population of Green-feathered birds decreases.
Learn more about mechanism here: brainly.com/question/1320373
