Albatrosses soar continents on almost no effort
Diomedeidae are giant tubenose seabirds of the Southern Ocean and North Pacific, missing as breeders from today's North Atlantic. Great albatrosses stretch wingspans to two and a half to three and a half metres. Dynamic and slope soaring let them travel huge distances while barely flapping—yet twenty-one of twenty-two IUCN-listed species face conservation worry.
They share the order Procellariiformes with petrels and shearwaters. Four genera are usually recognised: great albatrosses (Diomedea), mollymawks (Thalassarche), North Pacific forms (Phoebastria), and sooty albatrosses (Phoebetria), though species counts swing between about thirteen and twenty-four, with twenty-one widely accepted. Gary Nunn's nineteen ninety-six mitochondrial DNA work revived Phoebastria and Thalassarche after decades of lumping. The English name drifted from Arabic words for a diving pelican through Portuguese Alcatraz—also behind the prison name—while Southern sailors still say mollymawk.
Life history matches ocean scale. Colonies crowd remote islands; pairs take years to bond and then raise at most one chick per breeding attempt, often skipping years. Food is squid, fish, and krill taken by scavenging, surface seizing, or shallow dives. Longline fisheries hook birds chasing bait; introduced rats and cats raid nests; plastic and climate stress add pressure. Feather harvesting once hammered numbers. Of the twenty-two IUCN species, two are Critically Endangered, seven Endangered, six Vulnerable, and six Near Threatened.
Fossils of short-tailed albatross show the family once used the North Atlantic into the Pleistocene, so today's gap is historical, not absolute. Molecular clocks place procellariiform radiation roughly thirty-five to thirty million years ago in the Oligocene, with possible Cretaceous roots. Taxonomy wars continue—Sibley-Ahlquist even folded seabirds into a giant Ciconiiformes—but field reality is simpler: few avian lineages trade so much sky for so little muscle power, or pay such a steep price when industrial fishing lines cross their wind highways.
Source: Albatross
