1. Yangtze River dolphin (Lipotes vexillifer) | CRITICALLY ENDANGERED |  | Long considered the world‘s rarest and most threatened cetacean, this species may already be extinct.
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2. Long-beaked echidna (Zaglossus bruijni) | ENDANGERED | | One of the most primitive mammals on the planet, this species lays eggs like a reptile.
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3. Riverine rabbit (Bunolagus monticularis) | CRITICALLY ENDANGERED |  | This ancient rabbit is one of South Africa‘s rarest and most endangered mammal species.
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4=. Cuban solenodon (Solenodon cubanus) | ENDANGERED |  | This primitive insectivore was believed to be extinct until its rediscovery in 2003.
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4=. Hispaniolan solenodon (Solenodon paradoxus) | ENDANGERED |  | This ancient insectivore has modified incisors which enable it to inject venom into its prey like a snake.
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6. Sumatran rhinoceros (Dicerorhinus sumatrensis) | CRITICALLY ENDANGERED | | This two-horned rhino is the smallest and most threatened of the five living rhinoceros species.
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7. Black rhinoceros (Diceros bicornis) | CRITICALLY ENDANGERED | | This two-horned African rhinoceros has suffered more persecution than any other species of rhino.
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8. Bactrian camel (Camelus bactrianus) | CRITICALLY ENDANGERED | | Fewer than 1,000 of these two-humped camels survive today in one of the most hostile regions on earth.
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9. Northern hairy-nosed wombat (Lasiorhinus krefftii) | CRITICALLY ENDANGERED | | This heavily-built marsupial is the largest known herbivorous burrowing mammal.
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10. Sumatran rabbit (Nesolagus netscheri) | CRITICALLY ENDANGERED |  | This shy nocturnal mammal is so rare and cryptic that local people do not even have a name for it.
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11. Javan rhinoceros (Rhinoceros sondaicus) | CRITICALLY ENDANGERED | | With fewer than 60 individuals remaining, this is the rarest of all the living rhinoceros species.
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12. Asian elephant (Elephas maximus) | ENDANGERED | | Asia's largest mammal, this 'keystone' species plays a vital role in maintaining its forest ecosystem.
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13. African wild ass (Equus asinus) | CRITICALLY ENDANGERED | | Domestic donkeys are now found all over the world, yet only a few hundred of their wild ancestors survive.
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14. Onager (Equus onager) | CRITICALLY ENDANGERED | | The onager is the swiftest of all the equids. It has been recorded running at speeds of up to 70 km/h.
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15. Vietnam leaf-nosed bat (Paracoelops megalotis) | CRITICALLY ENDANGERED | | This large-eared bat is known from only a single specimen. It may already be extinct.
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16. Aye-aye (Daubentonia madagascariensis) | ENDANGERED | | The highly distinctive aye-aye is one of the most bizarre looking animals on the planet.
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17. Japanese dormouse (Glirulus japonicus) | ENDANGERED | | With a thick, bushy tail and a dark stripe on its back, this dormouse resembles a miniature chipmunk.
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18. Giant panda (Ailuropoda melanoleuca) | ENDANGERED | | The charismatic giant panda is the world's best known flagship species for conservation.
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19. Red panda (Ailurus fulgens) | ENDANGERED | | The scientific name of this rare and beautiful species literally means ’fire-coloured cat‘.
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20. Wroughton's free-tailed bat (Otomops wroughtoni) | CRITICALLY ENDANGERED | | The tail projects far beyond the free edge of the tail membrane, hence the common name “free-tailed bat”.
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21. Pygmy hippopotamus (Hexaprotodon liberiensis) | ENDANGERED | | This species secretes oils known as "blood-sweat" which keep its skin waterproof.
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22. Slender loris (Loris tardigradus) | ENDANGERED | | The slender loris is characterised by its enormous eyes and extremely thin limbs.
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23=. Golden bamboo lemur (Hapalemur aureus) | CRITICALLY ENDANGERED | | Every day this lemur consumes the equivalent of 12 times the lethal dose of cyanide for most mammals!
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23=. Greater bamboo lemur (Hapalemur simus) | CRITICALLY ENDANGERED | | The largest of the bamboo lemurs, this species can be identified by its distinctive white ear tufts.
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25. Seychelles sheath-tailed bat (Coleura seychellensis) | CRITICALLY ENDANGERED | | Fewer than one hundred of these bats are thought to survive today.
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26. Anderson's mouse opossum (Marmosa andersoni) | CRITICALLY ENDANGERED | | This small mouse-like marsupial is thought to be extremely rare. It is known from only two localities.
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27. Mediterranean monk seal (Monachus monachus) | CRITICALLY ENDANGERED | | Revered by the ancient Greeks, this shy seal is today one of the world's most threatened marine mammals.
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28. Mountain pygmy possum (Burramys parvus) | ENDANGERED | | The largest of Australia's five pygmy possums, this tiny animal can live for an incredible twelve years.
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29. Golden-crowned sifaka (Propithecus tattersalli) | CRITICALLY ENDANGERED | | Considered to be one of the rarest of Madagascar's lemurs. No part of its range is protected.
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30=. Northern marsupial mole (Notoryctes caurinus) | ENDANGERED | | This marsupial mole is more closely related to the kangaroo than it is to true moles.
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30=. Southern marsupial mole (Notoryctes typhlops) | ENDANGERED | | Marsupial moles 'swim' through the sands of the deserts in which they live.
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32. Puerto Rican hutia (Isolobodon portoricensis) | CRITICALLY ENDANGERED | | Christopher Columbus and his crew are believed to have feasted upon this possibly extinct rodent.
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33. Bulmer's fruit bat (Aproteles bulmerae) | CRITICALLY ENDANGERED | | Having been almost hunted to extinction twice, this species is one of the most endangered bats in the world.
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34. Baird's tapir (Tapirus bairdii) | ENDANGERED | | This long-nosed primitive mammal resembles the ancestors of rhinos and horses.
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35. Gracile mouse opossum (Gracilinanus aceramarcae) | CRITICALLY ENDANGERED | | Little is known about this rare and cryptic species - only six specimens have ever been collected.
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36. Indri (Indri indri) | ENDANGERED | | The Malagasy people consider the indri to resemble their sacred ancestors.
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37. Hirola (Damaliscus hunteri) | CRITICALLY ENDANGERED | | The graceful hirola is Africa's most threatened antelope.
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38. Greater big-footed mouse (Macrotarsomys ingens) | CRITICALLY ENDANGERED | | A medium-sized mouse with large ears, long hind feet and an extremely long tail.
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39. New Guinea big-eared bat (Pharotis imogene) | CRITICALLY ENDANGERED | | There have been no confirmed reports of this species since 1890.
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40. Persian mole (Talpa streeti) | CRITICALLY ENDANGERED | | Known from only one individual, found in an area of intensive environmental disruption and military activity.
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41. Volcano rabbit (Romerolagus diazi) | ENDANGERED | | This small rabbit is believed to be the most primitive of all living rabbits or hares.
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42. Monito del monte (Dromiciops gliroides) | VULNERABLE | | The monito del monte or "mountain monkey" is regarded by scientists as a living fossil.
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43=. Fossa (Cryptoprocta ferox) | ENDANGERED | | Madagascar's largest carnivore, the fossa superficially resembles a small, low-slung puma.
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43=. Amami rabbit (Pentalagus furnessi) | ENDANGERED | | This ancient species is regarded as a ’living fossil‘. and has been declared a Japanese National Monument.
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45. Hainan gymnure (Hylomys hainanensis) | ENDANGERED | | This species is related to hedgehogs, although it lacks spines and looks very different.
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46. Golden-rumped elephant-shrew (Rhynchocyon chrysopygus) | ENDANGERED | | Recent studies indicate that elephant-shrews are in fact distantly related to elephants.
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47=. Dinagat moonrat (Podogymnura aureospinula) | ENDANGERED | | The Dinagat moonrat has stiff bristly or spiny fur on its back, making it look like its relative the hedgehog.
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47=. Mindanao gymnure (Podogymnura truei) | ENDANGERED | | This species of moonrat is a close cousin of the hedgehog.
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49. Bumblebee bat (Craseonycteris thonglongyai) | ENDANGERED | | The smallest mammal in the world, this bat is roughly the same size as a large bumblebee.
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50. Hairy-eared dwarf lemur (Allocebus trichotis) | ENDANGERED | | This cryptic species is one of the smallest of the living primates.
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51. Muennink's spiny rat (Tokudaia muenninki) | CRITICALLY ENDANGERED | | Named after the grooved spines that cover most of its body.
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52. Small-toothed mole (Euroscaptor parvidens) | CRITICALLY ENDANGERED | | This mole spends much of its time eating earthworms stored in its underground "pantry".
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53. Dugong (Dugong dugon) | VULNERABLE | | Dugongs are sometimes referred to as “sea cows” because they feed almost exclusively on sea grass.
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54. Leadbeater's possum (Gymnobelideus leadbeateri) | ENDANGERED | | This Australian marsupial has been adopted as one of the faunal emblems of the state of Victoria.
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55. Nimba otter-shrew (Micropotamogale lamottei) | ENDANGERED | | This semi-aquatic shrew looks like an otter and has a long slender tail.
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56. New Zealand lesser short-tailed bat (Mystacina tuberculata) | VULNERABLE | | The world's most terrestrial bat, this species fills the niche of mice or shrews in other parts of the world.
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57. Short-tailed chinchilla (Chinchilla brevicaudata) | CRITICALLY ENDANGERED | | The Chinchilla was named after the South American Chinca Indians by the Spaniards in the 1500s.
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58=. Malayan water shrew (Chimarrogale hantu) | CRITICALLY ENDANGERED | | A relatively large shrew, which is well adapted to its semi-aquatic lifestyle.
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58=. Sumatran water shrew (Chimarrogale sumatrana) | CRITICALLY ENDANGERED | | This poorly known water shrew is known only from a single locality.
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60. Desert dormouse (Selevinia betpakdalaensis) | ENDANGERED | | This dormouse has the unusual habit of shedding the upper layers of its skin when it moults.
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61. Salenski's shrew (Soriculus salenskii) | CRITICALLY ENDANGERED | | This small shrew is known only from a single specimen.
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62. Saiga antelope (Saiga tatarica) | CRITICALLY ENDANGERED | | One of the world's fastest animals, the distinctive saiga can reach speeds of up to 80 km/h.
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63. Maned three-toed sloth (Bradypus torquatus) | ENDANGERED | | The green algae that live in the fur of sloths provide them with excellent camouflage.
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64. Iranian jerboa (Allactaga firouzi) | CRITICALLY ENDANGERED | | The mouse-like jerboa has very long hind legs. It can leap up to three metres in a single bound.
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65=. Ganges River dolphin (Platanista gangetica) | ENDANGERED | | This river dolphin can detect light, but its eyes lack lenses, leaving it unable to resolve images.
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65=. Indus River dolphin (Platanista minor) | ENDANGERED | | The local name ’bhulan‘ is said to refer to the noise this dolphin makes when it breathes.
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67. Chacoan peccary (Catagonus wagneri) | ENDANGERED | | A pig-like mammal known only from fossils until discovered alive in the 1970s.
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68. Senkaku mole (Nesoscaptor uchidai) | ENDANGERED | | Only one Senkaku mole has ever been captured, and very little is therefore known about the species.
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69. Handley's slender mouse opossum (Marmosops handleyi) | CRITICALLY ENDANGERED | | The mouse like marsupial is threatened by habitat loss, and is only known from a single locality.
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70. Long-footed potoroo (Potorous longipes) | ENDANGERED | | Potoroos are small rabbit-sized kangaroos, often called ’rat-kangaroos‘.
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71. Philippine flying lemur (Cynocephalus volans) | VULNERABLE | | Neither a true flier nor a lemur, this distinctive mammal is part of an ancient lineage of gliding mammals.
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72=. Inquisitive shrew-mole (Uropsilus investigator) | ENDANGERED | | This primitive mole more closely resembles a shrew.
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72=. Chinese shrew-mole (Uropsilus soricipes) | ENDANGERED | | This primitive mole's unspecialised limbs suggest that it probably does not burrow through the soil.
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74. Indian rhinoceros (Rhinoceros unicornis) | ENDANGERED | | The largest of the Asian rhinos, the Indian rhinoceros can be easily identified by its armour-like skin.
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75. Armenian birch mouse (Sicista armenica) | CRITICALLY ENDANGERED | | Like its relatives the jumping mice and jerboas, this little mammal travels on the ground by leaping.
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76. Chapa pygmy dormouse (Typhlomys chapensis) | CRITICALLY ENDANGERED | | This species is not a true dormouse.
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77. African elephant (Loxodonta africana) | VULNERABLE | | The largest living terrestrial mammal.
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78. Vaquita (Phocoena sinus) | CRITICALLY ENDANGERED | | The vaquita is the world‘s smallest and most endangered marine cetacean.
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79. Yellow-tailed woolly monkey (Lagothrix flavicauda) | CRITICALLY ENDANGERED | | This distinct species of woolly monkey was thought to be extinct until its rediscovery in 1974.
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80. Mountain tapir (Tapirus pinchaque) | ENDANGERED | | The mountain tapir is the smallest and most endangered of the four species of tapir.
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81. Long-eared jerboa (Euchoreutes naso) | ENDANGERED | | This small jumping rodent can be distinguished from other jerboas by its enormous ears.
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82=. Grevy's zebra (Equus grevyi) | ENDANGERED | | The largest member of the zebra family.
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82=. Mountain zebra (Equus zebra) | ENDANGERED | | The only zebra species to possess a dewlap, or skin fold on its throat.
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84. Amazonian manatee (Trichechus inunguis) | VULNERABLE | | The smallest member of the manatee family.
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85. Peter's tube-nosed bat (Murina grisea) | CRITICALLY ENDANGERED | | This species is known from only a single specimen, and has not been reported for more than a century.
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86. Chinese dormouse (Dryomys sichuanensis) | ENDANGERED | | This dormouse is active at night. It sleeps during the day in a nest hidden in a small tree.
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87. Blunt-eared bat (Tomopeas ravus) | VULNERABLE | | This primitive mammal is the sole representative of a subfamily of bats.
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88=. Blue whale (Balaenoptera musculus) | ENDANGERED | | The blue whale is the largest mammal ever known to have existed.
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88=. Fin whale (Balaenoptera physalus) | ENDANGERED | | Fin whales are the second largest mammals on earth. They are named after their large, curved dorsal fins.
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90. Falanouc (Eupleres goudotii) | ENDANGERED | | The falanouc can store fat in the base of its tail during the cold dry months when food is in short supply.
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91. Mount Kahuzi climbing mouse (Dendromus kahuziensis) | CRITICALLY ENDANGERED | | This climbing mouse posesses a remarkably long, semi-prehensile (grasping) tail.
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92. Bushy-tailed opossum (Glironia venusta) | VULNERABLE | | The scientific name of this medium-sized opossum roughly translates as "charming dormouse-like animal".
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93. Gallagher's free-tailed bat (Chaerephon gallagheri) | CRITICALLY ENDANGERED | | This bat has a length of “free” tail which extends beyond the membrane attached between the hind legs.
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94. Old World sucker-footed bat (Myzopoda aurita) | VULNERABLE | | Special suction pads on its wrists and ankles allow this bat to cling to smooth leaf surfaces while roosting.
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95. Malagasy giant jumping rat (Hypogeomys antimena) | ENDANGERED | | Madagascar's largest rodent can jump to a metre into the air when faced with danger.
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96. Imaizumi's horseshoe bat (Rhinolophus imaizumii) | ENDANGERED | | Horseshoe bats are named after their complex horseshoe-shaped "nose-leafs".
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97. Orangutan (Pongo pygmaeus) | ENDANGERED | | "Orangutan" is a Malay word meaning "person of the forest".
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98=. Chiapan climbing-rat (Tylomys bullaris) | CRITICALLY ENDANGERED | | Although it superficially resembles the black rat, these two species are in fact very distantly related.
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98=. Tumbala climbing-rat (Tylomys tumbalensis) | CRITICALLY ENDANGERED | | This hind feet of this poorly known species are modified for climbing.
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100. Setzer's mouse-tailed dormouse (Myomimus setzeri) | ENDANGERED | | This unusual dormouse has a mouse-like tail and lives on or under the ground.
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