3/20/2023 0 Comments Western black rhinoceros extinctThe alaotra grebe, which is also known as a Delacour’s little grebe or a rusty grebe, was declared extinct in 2010, although it might have been extinct years earlier. Habitat destruction and the rapid spread of disease-carrying mosquitoes are thought to be responsible for the species’ decline. If any have survived, the population would be extremely small. Scientists say the species may already be extinct, but surveys in all areas of potential habitat are needed to confirm this. The black-faced honeycreeper, or po’o-uli, is endemic to Hawaii’s island of Maui and is listed as “critically endangered/possibly extinct.” Of the three known birds discovered in 1998, one died in captivity in 2004 and the remaining two have not been seen since that year. The International Union for Conservation of Nature assessed the species in 2008 and declared it extinct, but the reasons for its extinction remain unknown. The only remaining specimen of the bird resides in the Merseyside County Museum, and scientists say it’s likely that the species was close to extinction before European exploration began in the Pacific. The Liverpool pigeon, or spotted green pigeon, is an extinct bird species of unknown origin, although some researchers speculate it might have lived in Tahiti. The decline of the Spix’s macaw is attributed to hunting and trapping, habitat destruction and the introduction of Africanised bees, or “killer bees,” which compete for nesting sites. However, a single male bird was discovered in 1990 and paired with a female bird in captivity, but seven weeks after the female’s release, she collided with a power line and died. The bird is native to northern Brazil and in 1987 the three known remaining birds were captured for trade. The species is currently listed as “critically endangered” instead of “extinct in the wild” because not all areas of potential habitat have been thoroughly surveyed. What caused the Pyrenean ibex’s extinction remains unknown, but some hypotheses include poaching, diseases and the inability to compete with other species for food.Īlthough 71 Spix’s macaws exist in captivity (like the two pictures here), the last known bird in the wild disappeared in 2000 and no others are known to remain. Scientists took skin cells from the animal’s ear and preserved them in liquid nitrogen, and in 2009 an ibex was cloned, making it the first species to become “unextinct.” However, the clone died just seven minutes later due to lung defects. The last Pyrenean ibex, a female nicknamed Celia, was found dead in northern Spain on Jan. The species was once numerous and roamed across France and Spain, but by the early 1900s its numbers had fallen to fewer than 100. The Pyrenean ibex is one of two extinct subspecies of the Spanish ibex. The reasons for the bird’s extinction is not fully understood, but researchers speculate that an introduced disease, such as avian malaria, might have played a significant role in the species’ decline. A reintroduction plan is being developed, but about 75 Hawaiian crows would be needed for the plan to work. The birds were released into a lightly managed habitat and closely monitored, but releases were abandoned in 1999 because of increasing mortality. Some birds remain in captivity, and between 19, more than 40 birds were hatched in a captive breeding program. This native Hawaiian bird was declared “extinct in the wild” in 2002 when the last two known wild individuals disappeared. The amphibian disease chytridiomycosis, airborne pollution and global warming probably contributed to the species’ demise. Extensive searches for the golden toad since then have failed to locate another specimen, and the species was declared extinct in August 2007. The toad’s breeding sites were well-known and closely watched - in 1988, only eight males and two females could be found, and in 1989, only a single male could be located. It was once a common species, but no specimen has been seen since 1989. The golden toad, which is sometimes referred to as the Monteverde toad or the orange toad, was a species that lived only in the Monteverde Cloud Forest Biological Reserve in Costa Rica.
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