In some countries, as the Shetland Islands, these birds are held in veneration. The care and protection of the sheep are almost entirely intrusted to them, owing to their possessing an inveterate hatred against Eagles; for as soon as the monarch of the air appears in view, three or four of them combine together to give him battle. They never attack him in front, but harass him pitilessly until his strength is so reduced that they can completely conquer him, or at least force him to retreat. In recompense for these services, the inhabitants are in the habit of throwing to the Skuas the refuse of their fisheries.
These birds almost always live in solitude, so that they may be more readily able to procure their food, which consists of fish, mollusks, eggs, young sea-birds, and small mammals. They inhabit the Arctic regions of Europe and America, and make their nests in the heather; they lay from two to four eggs, which are sat upon by the male and female birds alternately. They are courageous enough to defend their young brood against any kind of animal, and even against man.
There are four European species: the Parasite Skua (Lestris parasiticus), which inhabits Greenland, Newfoundland, and Spitzbergen, and visits tolerably often our Atlantic coasts; Richardson's Skua (Lestris Richardsonii), which is very plentiful in Sweden, Norway, Lapland, and North America; the Pomerine Skua (Lestris pomarinus), which is very common in Newfoundland, Iceland, and the Feroë Islands; the Common Skua (Lestris cataractes), commonly called the Brown Stoëland.
The Petrels (Procellaria, Linn.) are characterised by a gibbous beak, the extremity of which is hooked, and seems made all in one piece, and as if jointed on to the rest of the upper mandible. These birds never dive, and rarely swim; but in their rapid flight they skim over the waves, and actually appear to walk upon the waters. To this habit they owe the name of Petrel, which simply means "Little Peter," in allusion to the miracle of St. Peter, who walked upon the restless waters of the Lake of Genesareth.
The family of the Petrels contains several species of very different appearance. They traverse immense distances in their powerful and rapid flight, although they nearly always keep close to the water. They never draw near to the coast except to build their nests, for which purpose they select a little crevice in some steep rock, in which they deposit a large white egg. While sitting upon it, they keep up a low and continual noise, like that of a spinning-wheel.
Fig. 112.—The Blue Petrel (Procellaria cærulea, Gmelin).
In general, Petrels are not of a very engaging aspect; but they are an invaluable resource to the poor people who inhabit the islands in the frigid seas, who do not object to eat the flesh of these birds, although they principally value them for their warm down and the oil which can be extracted from their stomachs. The quantity of oil which these birds contain is so large that it is used as an article of diet. In the Feroë Islands candles are made from this oleaginous matter. Often, indeed, the islanders make the bird itself serve as a candle to illuminate their gloomy vigils. This is performed by passing a wick through the body of the bird when just killed.
These birds appear to love the tempest; they run over the roughest waves, and seem as if they were enjoying themselves as they pass up and down the declivities of the mountains of foam. When the storm is too violent for them, they take refuge upon the nearest rocks, or even on the yards of a passing ship. Sailors, who are confessedly simple and superstitious, take these birds for evil spirits, birds of the devil, harbingers of storms, and so forth, simply because they more frequently see them during a storm. Their black plumage tends to confirm the sailor in his superstition.
When the vessels sent to the whale fishery have passed the Shetland Islands, and entered the northern seas, which are almost always very rough, the Petrels are seen flying about amidst the eddies of foam which are formed by the movement of the ship. They keep in attendance until something is thrown overboard, for they are extremely voracious, and especially fond of fat, particularly that of the whale. When the fishermen begin to cut up a whale, the Petrels flock together to the number of several thousands. They are not afraid to approach within reach, so that they may be taken or killed with a blow from a boat-hook. Their plumage is so close, that shot fired at them, except at close range, will not penetrate.