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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.
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.
A flock of barnacle geese during autumn migration Examples of long-distance bird migration routes. Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year.
Rafts move closer to the island during the night and further away in the morning which produces a "halo" effect - where no birds are found close to the island during daylight. These day-night cycles of rafting distributions are prominent for Manx shearwaters around Skomer Island and might provide a way of waiting for dusk that reduces predation ...
The colony is at its most active in the evening, with birds standing outside their burrows, resting on the turf, or strolling around. Then, the slopes empty for the night as the birds fly out to sea to roost, often choosing to do so at fishing grounds ready for early-morning provisioning. [16]: 44–65
The majority of procellariiforms nest once a year and do so seasonally. [69] Some tropical shearwaters, like the Christmas shearwater, are able to nest on cycles slightly shorter than a year, and the large great albatrosses (genus Diomedea) nest in alternate years (if successful). Most temperate and polar species nest over the spring-summer ...
Many types of seabirds are vulnerable to injury and death as a result of being attracted to artificial lights at night. This is a particular threat for petrels and shearwaters. [ 27 ] Burrow-nesting seabirds like the Westland petrel returning to their burrows at night, or leaving them before dawn, can become disoriented by artificial lights and ...