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. Deemed “the goddess of the river,” the dolphin’s skin was highly valuable and used to make gloves and handbags. The decline in the baiji dolphin population is attributed to a variety of factors including overfishing, boat traffic, habitat loss, pollution and poaching. The foundation published a report on the expedition and declared the animal functionally extinct, meaning too few potential breeding pairs remained to ensure the species’ survival. In 2006, scientists from the Baiji Foundation travelled up the Yangtze River for more than 2,000 miles equipped with optical instruments and underwater microphones, but were unable to detect any surviving dolphins. The last documented sighting of China’s baiji dolphin, or Yantze River dolphin, was in 2002, and while the species is listed as critically endangered, scientists say it may already be extinct. No West African black rhinos are known to be held in captivity. The rhino was listed as “critically endangered” in 2008, but a survey of the animal’s last remaining habitat in northern Cameroon failed to find any sign of the rhinos, either a true siting or even evidence of its presence, like feces or feeding signs. The species, Diceros bicornis longpipes, was once widespread in central Africa, but the population began a steep decline due to poaching. The rarest of the black rhino subspecies, the West African black rhinoceros, is now recognised by the International Union for the Conservation of Nature (IUCN) as extinct. Here’s a look at the species that were declared extinct this decade, with the West African black rhino topping the list. But the past 10 years also saw some animals wiped from existence. From 2001 to 2010, new species were found, ground-breaking animal research was published, and some species were brought back from the brink of extinction. In 2011, with no sightings in a decade, the International Union for Conservation of Nature formally declared that the western black rhino had gone extinct.The first decade of the 21st century was ripe with discoveries and innovations in the animal kingdom. All rhinos suffered the western black rhino, already weakened by decades of overhunting, was the hardest hit. Between 19 an astonishing 98 percent of black rhinos were killed by poachers. Farmers and ranchers at the time viewed large herbivores such as rhinos as pests and dangers to their crops. Industrial agriculture came next, clearing many historic rhino habitats for fields and settlements. Widespread sports hunting in the first decades of the century quickly decimated rhino populations. Although it had lived in these countries for centuries, the western black-like most rhinos-found itself to be incompatible with the 20th century. "Historically, the western black rhino had a fairly large range across central and western Africa, with populations in modern-day Cameroon, Chad, the Central African Republic, Sudan and South Sudan, making it the northernmost African rhino subspecies.
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