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Seabird mortality caused by long-line fisheries can be greatly reduced by techniques such as setting long-line bait at night, dying the bait blue, setting the bait underwater, increasing the amount of weight on lines and by using bird scarers, [104] and their deployment is increasingly required by many national fishing fleets.
These oceanic waters have such a vast extent of 15 × 10 ^ 6 –30 × 10 ^ 6 km 2 (6 × 10 ^ 6 –12 × 10 ^ 6 sq mi) that each bird has more than 1 km 2 of range at its disposal, so is seldom seen out at sea. [16]: 30 In Maine, light-level geolocators have been attached to the legs of puffins, which store information on their whereabouts. The ...
Adult near Burrow on Bruny Island. The photograph was taken at night. Fledgling, Austins Ferry, Tasmania, Australia. The short-tailed shearwater or slender-billed shearwater (Ardenna tenuirostris; formerly Puffinus tenuirostris), also called yolla or moonbird, and commonly known as the muttonbird in Australia, is the most abundant seabird species in Australian waters, and is one of the few ...
They nest in burrows and often give eerie contact calls on their night-time visits. They lay a single white egg. They lay a single white egg. The chicks of some species, notably short-tailed and sooty shearwaters, are subject to harvesting from their nest burrows for food, a practice known as muttonbirding , in Australia and New Zealand.
The Hebrides (Outer Hebrides in orange). The flora and fauna of the Outer Hebrides in northwest Scotland comprises a unique and diverse ecosystem.A long archipelago, set on the eastern shores of the Atlantic Ocean, it attracts a wide variety of seabirds, and thanks to the Gulf Stream a climate more mild than might be expected at this latitude.
The Swiss naturalist Conrad Gessner gave the northern gannet the name Anser bassanus or scoticus in the 16th century, and noted that the Scots called it a solendguse. [4] The former name was also used by the English naturalist Francis Willughby in the 17th century; the species was known to him from a colony in the Firth of Forth and from a stray bird that was found near Coleshill, Warwickshire.
A few species nest in small or dispersed groups, but most breed in colonies of up to a few hundred pairs, often alongside other seabirds such as gulls or skimmers. [5] Large tern species tend to form larger colonies, [18] which in the case of the sooty tern can contain up to two million pairs. Large species nest very close together and sit ...
Nesting sites are attended at night to avoid predators. [13] Storm petrels display high levels of philopatry, returning to their natal colonies to breed. In one instance, a band-rumped storm petrel was caught as an adult 2 m from its natal burrow. [14] Storm petrels nest either in burrows dug into soil or sand, or in small crevices in rocks and ...