The Storm-Petrel breeds in the Orkney, Shetland, and Scilly Islands and a few on the Welsh coast, also in the Channel Islands, but a genuine ocean-bird quits the land as soon as its young are able to accompany it. It is frequently seen in the Atlantic and Mediterranean, and is not an uncommon visitor to our shores, especially during severe weather.
Its note is only heard during the season of incubation, when its retreat is often betrayed by a low twittering.
Storm-Petrels are gregarious birds; they breed in colonies, and skim the sea in small flocks. The French steamers which sail between Toulon and Algiers are said to be regularly accompanied by these birds.
THE FORK-TAILED PETREL PROCELLARIA LEUCORRHOA
General plumage like the last; tail forked; legs moderate; membrane dusky Length seven and a quarter inches. Eggs white, marked with small rusty spots.
The Fork-Tailed Petrel, a native of North America, does not differ materially in habits from the other species. It is met with almost annually on our east coast, and is common off Cornwall. In Ireland it is frequent. This species was first declared to be a British bird by Bullock, who found it at St. Kilda in 1818.