1. Armadillo
   Blue whale
2. African penguin
   Agouti

The blue whale is a marine mammal which is the largest animal to have ever lived on Earth. They can grow to lengths up to 100 feet long and have weighed upward of 200 tons (400,000 pounds). Some of this endangered species’ internal organs have been estimated to weigh as much as an automobile.

1. Giant softshell turtle
   Bald eagle
2. Whale shark
   Golden eagle

Whale sharks, which can grow to lengths of more than 40 feet and weights exceeding 20 tons (40,000 pounds), are the largest fish in the sea. Despite their name, they are docile and feed on plankton and other small fish.

1. African elephant
   Gharial
2. Cassowary
   Klipspringer

The African elephant is the largest land animal in the world. A fully grown adult can be as tall as 13 feet, can weigh upwards of 7 tons (14,000 pounds), and has an average life span of 70 years. These animals can consume up to 300 pounds of food in a single day.

1. Jacana
   Babirusa
2. Narwhal
   Southern elephant seal

The Southern elephant seal is the largest in the seal family, and the largest marine mammal, excluding the cetaceans. Named after the elephant because of its large size, the males can weigh upwards of 4 tons (8,000 pounds) when fully grown.

1. Stonefish
   Antelope
2. Water buffalo
   Biturong

The Water buffalo, also called the Asian buffalo, is one of the largest members of the Bovini tribe, standing over 6 feet tall at the shoulder and weighing upwards of 1.3 tons (2,600 pounds). These herbivorous animals can be found in tropical and subtropical forests in Asia where they spend much of their time in muddy water.

1. Asian elephant
   Thorny dragon
2. Cichlid
   Bali myna

The Asian elephant is one of the largest land animals on Earth, but they are smaller than their African cousins, standing 6 to 9 feet tall at the shoulder and weighing as much as 5.5 tons (11,000 pounds) when fully grown. The animal’s trunk is thought to contain more than 100,000 different muscles.

1. Bateng
   Jerboa
2. California condor
   Gelada

The Banteng, sometimes called the tembadau, is a species of wild cattle commonly found in Southeast Asia, where they are used both for their meat and as working animals. They can grow up to 11 feet tall and have a total body weight of 0.9 tons (almost 1,800 pounds).

1. Pufferfish
   Bat-eared fox
2. Giant eland
   Hamadryas baboon

The giant eland, which is also called Lord Derby eland, is a species of antelope which can be found in some African countries. Known and hunted for its spiral-horned antelopes, the adult males can weigh upwards of 1 ton (2,000 pounds).

1. Proboscis monkey
   White rhinoceros
2. Capybara
   Andean condor

The white rhinoceros is a large land mammal which can mostly be found in Namibia, Zimbabwe, Kenya, and South Africa. Despite its name, it is actually grey. The highest recorded weight of the white rhino is 4 tons (8,000 pounds).

1. Glaucus atlanticus
   Fishing cat
2. Boa constrictor
   Alaskan moose

The Alaskan moose, also known as the giant moose, is the largest subspecies of moose found in North America. Large adult males can weigh up to 0.8 tons (1,600 pounds), and can also grow to heights upwards of 5.5 feet. Although they are not threatened, laws protect these solitary animals.

1. Basilisk
   Colossal squid
2. Zebra
   Vulture

The colossal squid, also known as the Antarctic squid, is the species of squid believed to be one of the largest in terms of mass as well as being the largest invertebrate in the world. Current estimates are at 46 feet in length and 0.83 tons (1,650 pounds).

1. Brown bear
   Platypus
2. Longcomb sawfish
   Caracal

The Longcomb sawfish, also called the green sawfish, is a species of sawfish which can be found in the tropical waters of the Indo Pacific Ocean. The critically endangered species can grow to lengths of 24 feet and weighs more than 0.65 tons (1,300 pounds).

1. Hippopotamus
   Leafy seadragon
2. Warthog
   Cockatoo

Hippopotamus, which comes from the Greek word for “river horse,” is an herbivorous semiaquatic animal found in many African countries. They can spend as long as 16 hours a day in rivers and waters to help them stay cool. Fully grown hippos can be as heavy as 4 tons (8,000 pounds).

1. Axolotl
   Vervet monkey
2. Crowned eagle
   Polar bear

Polar bears are carnivorous animals which can be found throughout the Arctic Circle where the temperature can be as low as minus 50 degrees Celsius. To survive, they have a number of adaptations, including pads on their paws for traction in the ice. These bears can be as heavy as 0.8 tons (1,600 pounds).

1. Bontebok
   Star-nosed mole
2. Giraffe
   Tree pangolin

Giraffes are the tallest mammals in the world. Their 6-foot tall legs are taller than most human beings. Found in the grasslands and savannas of Africa, each of these animals has a unique coat pattern. Their total height can exceed 16 feet, and they can weigh up to 1.4 tons (2,800 pounds).

1. Giant isopod
   Orca
2. Dung beetle
   Camel

The Orca, or killer whale, is one of the largest dolphins in the world and also one of the top apex predators. It feeds on seals, sea lions, and whales. These marine mammals, when fully grown, can exceed 32 feet in length and 6 tons (12,000 pounds) in weight.

1. Lungfish
   Black rhinoceros​
2. African elephant
   Rhinoceros

The black rhinoceros is so named because it has a pointed upper lip, making it different from the white rhinoceros. The difference in its lip shape allows it to get its food from trees and bushes rather than grazing on grass. The black rhino can weigh up to 1.5 tons (3,000 pounds).

1. Ostrich
   Flying fish
2. Fennec fox
   Flamingo

The ostrich is the world’s largest bird and it can be found in the savannas and deserts of Africa. These flightless birds are able to run at speeds exceeding 40 miles an hour, and have been found to be as tall as 9 feet and can weigh as much as 0.175 tons (350 pounds).

1. Red-tailed hawk
   Sea cow
2. Asian gaur
   Bonobo

The guar, sometimes called the Indian bison, is a vulnerable species of wild cattle which can be found in South and Southeast Asia. The adult males grow to an average height of 6 feet, 7 inches tall and can weigh as much as 1.5 tons (3,000 pounds).

1. Saiga
   Yak
2. Flying fox
   Galapagos tortoise

The yak is a long-haired mammal that can be found at elevations of 14,000 to 20,000 feet in China, Mongolia, and Nepal, where temperatures can be as low as minus 40 degrees Celsius. Wild yaks grow to heights exceeding 6 feet and they have an average weight of 1.1 tons (2,200 pounds).

1. Mimic octopus
   Giant anteater
2. Pygmy marmoset
   Saltwater crocodile

The Saltwater crocodile, also called the estuarine crocodile, is the largest living reptile in the world and can be found throughout India, parts of Bangladesh, Sri Lanka, and Australia. These animals can be as long as 17 feet and weigh as much as 0.5 tons (1,000 pounds).

1. Pink fairy armadillo
   Chimpanzee
2. Walrus
   Emu

The walrus is a marine mammal which can be found in the subarctic seas of the Arctic Ocean in the Northern Hemisphere. Known for their prominent tusks and mustaches, walruses can grow to 11 feet in length and weigh up to 1.5 tons (3,000 pounds).

1. Aye-aye
   Giant panda
2. Kodiak bear
   Tazmanian devil

The Kodiak bear, also called the Alaskan brown bear, is found exclusively in the Kodiak Archipelago near Alaska. These bears weigh an average of 0.66 tons (1,320 pounds), but have been known to exceed 0.75 tons (1,500 pounds).

1. American bison
   Maned wolf
2. Porcupine
   Harpy eagle

The American bison, also called the American buffalo, is a species of bison that has been around since 9000 BC. These animals, which are symbolic of the Great Plains, are some of the heaviest land animals in North America, some of which weigh as much as 1.1 tons (2,200 pounds).

1. Tufted deer
   Humpback whale
2. Secretary bird
   Coquerel's sifaka

The Humpback whale is a type of whale that can be found in oceans and seas around the world. These animals are known for their large size (they can weigh up to 33 tons (66,000 pounds) as well as their complex songs.

1. Polar bear
   Octopus
2. Guenon
   Cape buffalo

The Cape buffalo, also called the African buffalo, is one of the largest species of buffalo. It can be found in southern as well as eastern Africa. Although they are not very tall, they are extremely heavy, sometimes weighing more than 0.94 tons (1,900 pounds).

1. Hornbill
   Patagonian mara
2. Sturgeon
   Tapir

The sturgeon is the name of one of the 27 species of fish belonging to the Acipenseridae family, which are found in the Northern Hemisphere. They are usually found living in the sea but go up the river at least once a year to lay their eggs. Some of these fish can weigh upwards of 1.45 tons (2,900 pounds).

1. Leatherback turtle
   Naked mole rat
2. Iguana
   Pancake tortoise

The leatherback sea turtle is a vulnerable species of turtles and is also the largest living turtle in the world. The turtles lack a bony shell, and instead have a flexible carapace which looks like leather. They can weigh upwards of 1 ton (2,000 pounds).

1. Irrawaddy dolphin
   Wallaby
2. Sloth bird
   American alligator

The American alligator is a large reptile which can be found near freshwater rivers, swamps, marshes, and lakes in the southeastern United States. The once-endangered animal can exceed 10 feet in length and 0.5 tons (1,000 pounds) in weight.

1. Dugong
   Gray whale
2. Kingfisher
   Otter

The gray whale is a migratory whale that can be found in the North Pacific and North Atlantic oceans. Its crusty appearance is due to the parasites and other organisms which make a home on its body. These types of whales can grow to lengths exceeding 40 feet and weights exceeding 35 tons (70,000 pounds).

1. Echidna
   Dhole
2. King snake
   Great white shark

The great white shark, sometimes known as the great white, is a species of mackerel shark which can be found in many of the major oceans. This vulnerable species can exceed 20 feet in length and weigh more than 2.5 tons (5,000 pounds).

1. Gerenuk
   Babirusa
2. Ostrich
   Arabian camel

The Arabian camel, also known as a dromedary, is an even-toed ungulate which is the tallest of the camel species. Its single hump can store up to 80 pounds of fat and gives the camel the ability to travel up to 100 miles without water. They grow to over 7 feet tall at the hump and can weigh up to 0.8 tons (1,600 pounds).

1. Snow leopard
   Eastern gorilla
2. Lamprey
   Guanaco

The Eastern gorilla is a critically endangered species and the largest living primate. It can be found in the mountainous rainforests of the Democratic Republic of Congo, Rwanda, and Uganda. The animals can be as tall as 6 feet and weigh up to 0.175 tons (350 pounds).

1. Okapi
   Fossa
2. Gharial
   Komodo dragon

The Gharial, sometimes called the gavial, is known for its long and thin snout. It is a critically endangered crocodilian which is native to the Indian subcontinents. The animals can grow up to 15 feet in length and weigh up to 1.1 tons (2,200 pounds).

1. Manta ray
   Yeti crab
2. Lemur
   Striped hyena

The manta ray is a ray belonging to the Manta genus. The species has been listed as vulnerable due to pollution, and being caught in fishing nets, combined with its slow reproductive rate. Manta rays can have a wingspan exceeding 23 feet and can weigh up to 1.8 tons (3,600 pounds).

1. Superb bird of paradise
   Orangutan
2. Green anaconda
   Tamandua

The green anaconda is the largest snake in the world (in weight) and it can be found in the tropical rainforests near the Amazon and the Orinoco basin. The animals can exceed 30 feet in length and can weigh up to 0.275 tons (550 pounds).

1. Blob fish
   Sperm whale
2. Ocelot
   Leopard shark

The sperm whale, also called the cachalot, is the largest species of toothed whales found in many of the major bodies of water around the world. The whales can be as long as 50 feet and weigh as much as 45 tons (90,000 pounds).

1. Gobi jerboa
   Manatee
2. Nubian ibex
   Bengal tiger

The Bengal tiger is one of the largest members of the big cat family and can be found in some of the Indian subcontinents. Its numbers are significantly reduced due to habitat loss, fragmentation, as well as poaching. The tiger usually grows​ between 5 and 6 feet from head to tail and weighs as much as 0.25 tons (500 pounds).

1. Japanese spider crab
   Andean bear
2. Brown bear
   Dolphin

The brown bear is a solitary animal that can be found in the forests and mountains of North America, Asia, and America. These predators are able to run at speeds up to 30 miles per hour, and they are quite dangerous to humans. Brown bears can weigh up to 0.35 tons (700 pounds).

1. Marine iguana
   Giant squid
2. Meerkat
   Mandrill

The giant squid is one of the largest invertebrates on Earth and can be found all over the world. The average weight of the adult giant squid is 0.22 tons (440 pounds), but the largest squid found was over 59 feet long and weighed 1 ton (2,000 pounds).