31. Long-tailed Planigale
Also known as Ingram’s planigale or the northern planigale, it is the smallest marsupial species in the world. With a body length of 110 to 130 mm and weighing 4.3 grams, it is also among the smallest mammal species found in the world. Endemic to Australia, it was described in 1906.
Another small marsupial of similar size and weight is the Pilbara ningaui or Ealey’s ningaui from Western Australia. There are over 334 species of marsupials in the world and close to 70 percent of these occur in Australia, New Guinea, and nearby islands.
32. Tamaulipas Pygmy Owl
Among the 200 species of owls that are found all over the world, there are atleast three very small species of owls. Tamaulipas pygmy owl of Mexico is the smallest owl species in the world according to body length of only 13.5 cm. Elf Owl of North America is also among the smallest owls and in fact is world’s lightest owl. Another tiny owl is Long-whiskered Owlet of Peru, with a body length of 13 to 14 cm.
33. Cuvier’s Dwarf Caiman
Also known as musky caiman, it is smallest alligator, smallest caiman and the smallest of all living crocodilians. Its body length is only 1.3 to 1.5 m. These are found in several countries within South American continent. They normally like to live near elongated streams. Due to their small size, Cuvier’s Dwarf Caimans are sometimes kept in captivity as pets.
34. Sabah Rhinoceros
Sabah rhinoceros is the world’s smallest rhinoceros species. With a shoulder height of just one meter and thirty centimeters, this tiny rhino species is on the brink of extinction as only 30 to 50 individuals remain in the world. A subspecies of the Sumatran rhino, it is also known as eastern Sumatran rhinoceros or Bornean rhinoceros. Smallest of all rhinos, its scientific name (Dicerorhinus sumatrensis harrisoni) is named after British polymath Tom Harnett Harrisson due to his work in Bornean zoology. Sabah rhinoceros are found in rain forests of Sabah.
35. Pygmy Anteater
Also known as Silky anteater, it is the smallest anteater in the world. They are found in Central and South America. Their body length is 14 to 18 in and weigh from 175 to 400 g. Their color ranges from golden-brown to yellowish-grey. They have short snout and large claws. Their tails are long and can hold different objects in the wild.
36. Roborovski Hamster
Roborovski hamster is the smallest hamster in the world. Its whole body size is just 2 inches. They are found in deserts of Russia, Kazakhstan and northern China. This species of hamster is best known for its extraordinary speed and have been said to run an equivalent of four human marathons every night.
Peewee, a hamster holds the world record for its small size of measuring less than an inch. So small that he could fit easily into a match box. In fact, his growth stopped when he was only three weeks old while his five brother and sisters grow up to the normal size.
37. Pygmy Hog
Pygmy hog is the smallest pig in the world. With a body length of 28 inches (71 cm), 10 inches (25 cm) height and only 1 inch long tail, smallest wild pig is also very rare species. Weighing between 6 to 12 kg, there are less than 150 individuals remaining in the world. Once found in India, Nepal, and Bhutan, they are now endemic to Assam, India. Pygmy hogs are only pigs in the world that make small nests in the wild.
On the other hand, it is very important to make it clear that there is no official established breed of Miniature pigs, Potbellied pigs, Teacup pigs, Mini pigs, Micro pigs and Pocket pigs. There are smaller versions, but not any “micro pig”. When searching on internet there are so many pictures of tiny pigs that are claimed to be miniature pig breed, but the reality is that they are all pictures of piglets that are not completely grown yet. When these “miniature pigs” or “teacup pigs” grow in full size, they will end up in a large animal having massive weight of up to 348 Pound (25 stone or 158 kg) and height.
38. Mediterranean Miniature Donkey
Donkeys are found everywhere in the world. They are popular for domestication because they are social animals. Miniature donkeys claimed to be found worldwide. But according to our research, Mediterranean miniature donkey is the smallest donkey breed in the world. Originally from Mediterranean islands of Sicily and Sardinia, they are also known as Sicilian or Sardinian donkeys according to their type of ancestry.
Sicilian donkeys range in size from 26 to 36 inches. Miniature donkeys were introduced to U.S. in 1929. Now there are over 15,000 of these donkeys in the United States. Lifespan of these miniature donkeys is around 30 to 35 years.
Shortest donkey ever recorded by Guinness World Records is KneeHi of Florida with a height of just 64.2 cm (25.29 in).
39. Lesser Mouse-Deer
Lesser mouse-deer is the smallest hoofed mammal in the world. Also known as the lesser Malay chevrotain, adults are only 18 inches (45 cm) in length and weighs 2 kg (4.4 lb). It is found in Southeast Asian countries. Natural enemies of lesser mouse-deer are feral dogs.
40. Ouessant Sheep
Also known as Anglicized Ushant, Ushant or Breton Dwarf, it is the smallest sheep breed in world. This smallest breed originated in the Brittany area of France and stand 45 to 49 centimeters in height. Despite their smaller size, rams of the species have relatively big horns. Ewes are polled, give birth to a single lamb and very occasionally producing a twin. Although being raised in many European countries, Breton Dwarf is still considered as a rare breed. There are only about 3,000 Ouessant Sheep in world.