The Puffins and Petrels are now the only birds nesting on the summit of the Rock, not a single descendant of the one hundred thousand Gannets which, according to Bryant, occupied the top of the Rock in 1860 now being found there. To-day this species nests only on the less accessible border ledges on the face of the Rock, where they are grouped in colonies. Most of them were incubating, but several were brooding their young, which ranged in size from the naked, black-skinned, newly hatched chick to those that had acquired the white, swan’s-downlike first plumage.[97]
With the exception of two white, black-spotted birds, all the Gannets seen, both on Bird Rock and Bonaventure, were in the adult white plumage, and if, as has been stated, this plumage is not gained until the bird is two years old, the question arises, What becomes of the immature birds during the nesting season?
97. Young Gannet.
An estimate of the number of individuals representing the seven species just mentioned as nesting on the Rock, is perhaps not warranted by my brief experience, nor should I attempt to give one, did not my photographs permit me to count with a fair degree of accuracy the number of birds in view on that part of the Rock shown in these pictures. Time was lacking to make, from a boat, a series of photographs of the Rock which would include all its bird-inhabited portions, and the appended estimates are based on the results of a count of the birds in photographs of about one half the occupied area. Murres, Razorbills, and Puffins can not be distinguished in these pictures and are therefore grouped under one head, it being calculated that about from fifteen hundred to two thousand individuals of these species make the Rock their home. Of this number probably not more than one hundred are Puffins, while the Common and Brünnich’s Murres (Uria troile et U. lomvia) outnumber the Razorbills at least four to one.
98. Gannets. × 3. An enlarged detail of No. 99.
The Kittiwake population of the Rock probably numbers between six hundred and eight hundred birds; of Gannets, there are perhaps left only fifteen hundred of the more than one hundred thousand birds which Dr. Bryant writes of as living on the top of the Rock alone; and of Petrels, not more than fifty.
When on the Rock I should have said that it was tenanted by at least ten thousand birds, and I was not a little surprised to find that the evidence furnished by my photographic records gave a total of about four thousand birds. However, the sight of four thousand birds domiciled in one small islet is sufficiently impressive to increase the pulse beat of the most phlegmatic traveler; and even if this estimate be too large, the Rock’s merits as a bird resort are too substantial to be affected by any decrease in it which truth demands.
To return to an account of the day’s doings, the light, as has been said, was unfavorable for photography, and the time was devoted to collecting and preparing specimens and making a hurried survey of the bird rookeries on the Rock, with results briefly set forth above; but late in the afternoon the sun gave indications of its whereabouts behind the clouds, and I immediately substituted the camera for the scalpel, and had Keeper Bourque lower me in the crate in order that I might secure photographs of the birds observed on our ascent.