1. Monkey
Smallest monkey pygmy marmoset can be seen in Brazil, Columbia, Ecuador and some places of Peru. This monkey grows to a height of 11 to 15 cm and has a 17-22 cm long tail. It weighs only 120 grams; and at the time of birth weighs only 15 grams. The lifespan of these monkeys are 11 to 16 years. They generally give birth to fraternal twins.
2. Rabbit
The Pygmy Rabbit is found in North America. It is the smallest leporid. The adult pygmy rabbit weighs about 400 grams having a body length of 24 cm to 29cm.
3. Dog
Smallest dog is Chihuahua that was first observed in 1850 in Mexico. The dog took its name from the state of Chihuahua in Mexico. The dog has a height of 6 to 9 inches and weighs 2 to 12 pounds. The lifespan is 15 years.
4. Cat
Meet MR.Peebles.It is the smallest cat in the world according to the Guinness World Records. It weighs about 1 kg and 15 cm long. It can fit in a 200 ml glass.
5. Horse
Thumbelina, is the smallest horse in the world .It weighs 27 kilograms. The height of this dwarf horse is only 17 inches.
6. Fish
Paedocypris is the smallest fish which measures only 7.9 mm in length. This is also considered as the smallest vertebrate. This f ish was discovered in the swamp forests of Indonesia’s Sumatra Island.
7. Frog
Brazilian Gold frog is the smallest frog and is found in the Southern Hemisphere. This is also known as Izecksonh’s Toad. The adult gold frogs grow to only 9.8 mm in body length.
8. Snake
Thread snake is found throughout North and South America, Africa and South-western Asia. The Thread Snake is the world’s smallest snake. It has the length of 4.25 inches. It is only found on some scattered islands in the Caribbean.
9. Bat
Philippine Bamboo bat is the smallest bat, which belongs to the Vespertilionid family. It measures 4 cm in length and weighs 1.5 grams. The wingspan of this bat is 15 cm.
10. Bird
Bee Hummingbird is the smallest bird. It is also known as Cuban bee as it is found mostly in Cuba. It measures 2.25 inches in length and 2 grams in weight. We cannot see its wings while flying as it flaps its wings 90 times per second. The heartbeat of this bird is 1,260 times. The size of its nest measures 0.78 inches width and 1.2 inches depth. Its eggs are smaller than coffee grounds.