In 1993 two females of a slightly different subspecies were put into his corral.
Two different shark subspecies appear to be breeding together in the waters off the coast of Australia.
Sumatran tigers are a critically endangered subspecies from Indonesia, of which fewer than 400 remain, according to the conservation group WWF.
It is because a lot of established subspecies have been reclassified as species.
The outlying virus was found in a second subspecies that exists further east.
It is hoped that classifying current subspecies as fully fledged species will help inform conservation plans to save the most threatened populations.
His plight as the only known member of his subspecies led to a series of ill-fated attempts to provide him with a mate.
CNN: Lonesome George, last of the Pinta Island tortoises, dies
The subspecies of cicadas known as Brood X has been underground for the last 17 years, tapped into tree roots, feeding and fattening up.
An issue of dispute is whether the dunes sagebrush lizard in question is truly a separate species, or rather, a common sagebrush lizard subspecies.
The Mexican wolf or El Lobo, a subspecies of the gray wolf, once roamed freely through the oak-woodlands of Arizona, New Mexico, Texas and Mexico.
Mr. Stephens jokes that he and his ilk are a unique human subspecies: He calls it malodorous technophilus and says it originated in Silicon Valley.
Known for their babyish faces, large ears and long tails, pygmy elephants were found to be a distinct subspecies only in 2003, after DNA testing.
First, worker-laid eggs that occur in other subspecies hatch into males.
Six of the islands have unique subspecies of this little fox.
Due to behavioural differences between the Cape and African subspecies, the African queen would have died by the 50th day and the hive crashed by the 100th.
It is one of four subspecies of the primate, although some recent research suggest that the differences between the subspecies are too small to warrant such classifications.
BBC: Chester Zoo team on the hunt for new species in Nigeria
Dr Fleischer's tree also suggests it may be time to abandon the Canada goose as a distinct species, and elevate its many subspecies one rung up the taxonomic ladder.
ECONOMIST: Feathers are flying in the world of bird classification
The other is that upgrading subspecies into species simultaneously increases the number of rare species (by fragmenting populations) and augments the biodiversity of a piece of habitat and thus its claim for protection.
The most prolific and deadly zoonotic is HIV, the virus that causes AIDS. In 1999, scientists at the University of Alabama at Birmingham traced the origins of HIV back to a subspecies of chimpanzee.
If the vaccinators did use chimp kidneys to make their polio vaccine in a Congolese lab near what is now called Kisingani, Hahn says would not have been of the subspecies that harbors the pandemic virus ancestor.
But despite the best efforts of conservationists -- and the presence of two female giant tortoises from a close subspecies sharing his enclosure at the Charles Darwin Research Station on Santa Cruz -- George remained a solitary creature.
CNN: Lonesome George, last of the Pinta Island tortoises, dies
But the advent of the chairlift puts an end to a valuable process of natural selection, by which those who reach the hut are sure to find, in its pure state, a small sample of a little-known human subspecies.
With a total of 380 in Virunga, and an estimated 320 in the delightfully named Bwindi Impenetrable National Park, in Uganda the only other place that the subspecies is found mountain gorillas are not, as it were, out of the woods yet.
ECONOMIST: The number of mountain gorillas appears to be rising
His death marks the end of the purebred Pinta Island tortoise, but there is hope that they will survive in some form: at least one first-generation descendant of the subspecies has been found at the Wolf volcano on neighboring Isabela Island.
CNN: Lonesome George, last of the Pinta Island tortoises, dies
应用推荐