The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Voyage of the Beagle by Charles Darwin:|
I do not think I ever saw so many birds of any other sort
together, as I once saw of these behind the island of Chiloe.
Hundreds of thousands flew in an irregular line for several
hours in one direction. When part of the flock settled on the
water the surface was blackened, and a noise proceeded from
them as of human beings talking in the distance.
There are several other species of petrels, but I will only
mention one other kind, the Pelacanoides Berardi which
offers an example of those extraordinary cases, of a bird
evidently belonging to one well-marked family, yet both in
its habits and structure allied to a very distinct tribe. This
The Voyage of the Beagle