how many different species of hedgehogs are there
Hedgehog A hedgehog is any of the spiny mammals of the subfamily Erinaceinae, in the eulipotyphlan family Erinaceidae. There are seventeen species of hedgehog in five genera, found through parts of Europe, Asia, and Africa, and in New Zealand by introduction. There are no hedgehogs native to Australia, and no living species native to the Americas (the extinct genus Amphechinus was once present in North America). Hedgehogs share distant ancestry with shrews (family Soricidae), with gymnures possibly being the intermediate link, and have changed little over the last 15 million years.[2] Like many of the first mammals, they have adapted to a nocturnal way of life.[3] Hedgehogs' spiny protection resembles that of the unrelated porcupines, which are rodents, and echidnas, a type of monotreme.
Hoolock gibbon The classification of this gibbon has changed several times in the past few years. Classically, all gibbons were classified in the genus Hylobates, with the exception of the siamang. After some studies, the genus was divided into three subgenera (including the siamang's Symphalangus), and then into four (recognizing Bunopithecus as the hoolock subgenus distinct from other gibbon subgenera). These four subgenera were elevated to full genus status. However, the type species for Bunopithecus is Bunopithecus sericus, an extinct gibbon or gibbon-like ape from Sichuan, China. Very recent investigations have shown the hoolocks are not closely related to B. sericus, so have been placed in their own genus, Hoolock. In the process, the two subspecies of hoolocks have been raised to species level.[1][2] A new subspecies has been described recently from northeastern India, which has been named Mishmi Hills hoolock, Hoolock hoolock mishmiensis.[7] A further new species, Hoolock tianxing, with an estimated population of about 200 in China, was discovered in southwest China in 2017.[8]