preview

The Common Rock Pigeon By Darwin 's Finches

Good Essays

revert back to square one, the common rock pigeon. Darwin eventually formed the argument that natural selection is the best at forming matches, as those who make poor mating choices will produce offspring that may not survive or reproduce, while individuals who make wise mating choices will produce offspring that is fit enough to survive and reproduce. It was important that individuals learned to discriminate against the old line and breed with the new one. Darwin noticed this discrimination with pigeons but not so much with his famed finches. Mating season among Darwin’s finches is met by a sort of ritual performed by the finches who are ready to mate. A male sings from his singing post to advertise himself to females. If a female comes he flies to her to examine her, to make sure she is one of his own kind. He flies to a nest he built and goes in and out, occasionally picking up some grass. If the female hops toward him a “sex chase” ensues, in which the male chases the female around his territory. In the rare occasion a male and female of the wrong species have courted each other, one of them will break it off. The finches typically have a very good ability to tell each other part despite looking ,mostly the same and all having the same way of courting. One slightly distinct thing is the male finch’s song, as there are typically two versions. Laurene Ratcliffe has been able to find that the finch’s songs have very subtle deviations. These deviations are usually passed

Get Access