21 largest animals in the world - List and photos

Help the development of the site, sharing the article with friends!

Image: Environmental News

The diversity of shapes, colors, sizes and behaviors that nature harbors arouses great interest and admiration for the animal and plant kingdom among the most curious. But, among all the mysteries that accompany the development of life on our planet, giant animals are one of the most shocking.

Have you ever wondered what is the largest animal that has ever existed in the world? Whether this is the case or not, I recommend that you continue reading this article by Ecologist Verde where you can find out what the 21 largest animals in the world, some of its curiosities and in what state of conservation they are.

Antarctic blue whale

The blue whale (Balaenoptera musculus) or fin whale, it is considered the largest animal in the world that has ever existed (There are fossil records of this species from 1.5 million years ago[1]). It can measure between 24-30 m in length and weigh 130-150 tons. For you to get to imagine the size of this mammal, it is interesting to know that its tongue can weigh the same as an elephant[2]. Here below you will see images of comparisons of this species with other large animals.

Despite the uniqueness of this cetacean, according to the IUCN it is found in danger of extinction (EN) its main threats are fishing and the degradation and alteration of its habitat as a consequence of climate change. We recommend you read this other article about Why the blue whale is in danger of extinction and also this one about What is the largest whale in the world.

Image: TopbuceoImage: Cantabrian nature

Boot lace worm

If we consider body length independent of weight, it is the boot lace worm (Lineus longissimus) the longest animal in the world, ahead of the blue whale, as the name of the species indicates.

With an average length of 30 m and up to 55 m, this thin and flabby worm belonging to the edge of the nemerteans, is currently listed in the Guinness Book of Records.

Lion mane jellyfish

Regarding its length, it is above the Antarctic blue whale and below the boot lace worm, with more than 36 m in length, but the lion's mane jellyfishCyanea capillata), also called lion's mane jellyfish, is the largest jellyfish that exists.

This species of cnidarian, which inhabits the deep and cold waters of the Arctic, the Atlantic and the Pacific, owes its name to the compact appearance and the length of its tentacles, which are equipped with stinging cells.

Fin whale

After the blue whale, the fin whale (Balaenoptera physalus) is the second largest cetacean in the world. With a size of up to 26 m length and a weight of approximately 75 tons, B. physalus It is characterized by its hydrodynamic and slender body constitution, which allows it to move at high speeds (more than 40 km / h)[3].

This migratory mammal is one of the most social balenoptérids that exist, so its sightings and contacts with boats are very common. Currently, the conservation status of this species is vulnerable (VU)According to the IUCN red list, its main threat was whaling carried out until the middle of the last century.

Sperm whale

The sperm whalePhyseter macrocephalus) is the largest odontocete (toothed cetacean) that exists. Being able to reach the 20 m length And till 57 tons of weightThis peculiar species, which inhabits the abyssal regions from the poles to the Equator, is easy to identify by its large and rounded head. In fact, as its scientific name suggests, it is the animal with the largest brain.

Despite being long-lived animals, the survival of sperm whales is threatened by commercial hunting and by the pollution of seas and oceans, so their conservation status is vulnerable (VU).

Giant squid

The giant squidArchiteuthis dux) is considered the largest invertebrate on Earth, with a length of 18 m and 1 ton of weight. This cephalopod, like the rest of squid, has eight arms and two tentacles. It is present in all oceans and is difficult to see because it lives at great depths; Despite this, it has been identified in various places such as Norway, Newfoundland, New Zealand and Australia.

Its conservation status is not threatened, although its populations could be altered considering that its predator is the sperm whale.

Gray whale

After the giant squid, the gray whale (Eschrichtius robustus) It is the largest animal of this classification that we make, with a size of up to 15 m in length and 35 tons of weight. As its name suggests, this mysticete has a generally gray coloration, although it is easy to distinguish it from other cetaceans by the large number of crustaceans (specifically barnacles) attached to its skin.

Currently, the distribution of this whale is restricted to the North Pacific, although its presence was common in the waters of the North Atlantic, until it became extinct in the area throughout the 19th century due to uncontrolled commercial hunting. Despite the threats that this species has faced, its protection has been key to recovering populations and reaching a conservation status, according to the IUCN, of least concern (LC).

Reticulated python

The reticulated python (Malayopython reticulatus) is the largest snake that exists. It belongs to the Pythonidae family, of boas and anacondas, and can measure more than 10 m and exceed 100 kg of weight. This species that is distributed by Southeast Asia, Indonesia and the Philippines, lives mainly in jungles and humid forests, although it is also possible to find it in the vicinity of rivers and other bodies of water.

Whale shark

The whale sharkRhincodon typus), with more than 12 m long and 34 tons weight, is considered the biggest fish in the world. This species with a broad and flat head with eyes located on its lateral ends, is popularly known as a checkerboard fish, domino or lady fish, due to the gray coloration with white dots and stripes that characterizes it.

As a curious fact, this lonely animal, despite the fame that sharks have in general, is not aggressive and does not pose a danger to humans; the reality is totally the opposite, humanity being a real threat to its conservation. In this sense, the commercialization of its meat, the pollution of seas and oceans and climate change, among other factors, have led to the whale shark being in danger of extinction (EN).


After the reticulated python, the common or green anaconda (Eunectes murinus), it is the second largest snake that exists, being able to measure 10 m long and weigh more than 100 kg. Originally from South America, this grayish-olive-green constrictor species lives in jungles and it is common to find it in shallow bodies of water, which is why it has a great swimming capacity.

The destruction of its habitat has become one of its main threats and, although its conservation status is of least concern (LC) according to the IUCN, this species is considered extinct in Argentina.

Killer whale

The killer whales (Orcinus orca) are among the largest animals in the world, being able to measure 9.57 m the smaller females and weigh up to 10.5 tons. Despite the fame that the poor translation of their name in English has given them, killer whale (who wanted to make more reference to "killer whales", since they feed on them, and not to "killer whale"), these cetaceans are very social animals that have always interacted with humans.

To get to know them better, we recommend you read these other articles:

  • Is the orca a whale?
  • How are killer whales classified?
  • Why the killer whale is in danger of extinction

African elephant

African elephants are one of the largest and heaviest land mammals in existence, standing 4 m tall, with up to 8 m in length and more than 10 tons of weight.

In Africa there are two types of species, Loxodonta african Y Loxodonta cyclotis, both threatened by the destruction of their habitats and by the hunting of specimens to commercialize the ivory of their tusks. So much is this that, L. africana It's in Danger of extinction Y L. cyclotis in critical danger of extinction according to the IUCN.

We encourage you to get to know them better by reading these other Green Ecologist articles on Where elephants live and what they eat and Why elephants are in danger of extinction.


The giraffe (Giraffa camelopardalis) is the tallest animal in the world. This African mammal that lives in savannas stands out for its long neck, which reaches 1.2 m, and for its blue tongue of half a meter in length, being able to measure a specimen in its entirety 6 m in height. Such is the size of these ruminants that, with one year of life, they already reach 2 m in height.

Currently their populations are in regression and their conservation status is vulnerable (VU), mainly due to hunting and the destruction of their habitat due to deforestation and military conflicts. Here you can read about Why the giraffe is in danger of extinction.

King Cobra

The royal or Burmese cobra (Ophiophagus hannah) is one of the largest land animals in the world, reaching body lengths of up to 5.5 m and weighing up to 12 kg. This species is widely distributed in Asia (southern China, the Philippines, Indonesia, Malaysia and Myanmar, among other regions) and is one of the five most poisonous snakes that exist.

Currently its state of conservation is vulnerable (VU), deforestation being one of its great threats.

Marine crocodile

The marine crocodile (Crocodylus porosus), also known as the saltwater crocodile, estuary or porous crocodile, is the largest reptile on the planet, measuring 4.5 m and despite 2 tons. This primitive-looking species inhabits estuaries, swamps, lakes, and coastal areas of India and Australia.

Get to know these reptiles better by reading the Characteristics of the crocodile.

Nile crocodile

After the marine crocodile, in this classification of the largest animals in the world, we find the Nile crocodile (Crocodylus niloticus), with an average size of 4.2 m (although there are specimens that measure up to 5m) And till 730 kg of weight.

This species, despite reaching its near extinction between the 40s and 60s of the last century due to the indiscriminate hunting of its specimens, its populations are stable and currently has a conservation status of least concern (LC).


The hippo (Hippopotamus amphibius) is another of the largest land animals on our planet. With an average body length of 4 m and a weight that ranges between 3,000 and 4,500 kgThis African mammal owes its name to its amphibian lifestyle. In fact, shallow bodies of water, such as rivers, lakes, lagoons, spend most of the time.

Currently threatened by hunting and habitat destruction, the hippo's conservation status is vulnerable (VU).

Polar Bear

The polar bear (Ursus maritimus), also known as the white bear, is a large animal, which can measure between 2.3 m and weigh up 700 kg. In fact, arctic pups weigh about 600 g at birth and reach 15 kg in their first months of life.

According to the IUCN, the conservation status of the polar bear is vulnerable (VU), but its descent proceeds very fast since it is one of the species most threatened by the melting of the polar ice caps. Read this other article to learn more about this species: Is the polar bear in danger of extinction?


Finishing this list we find the ostrich (Struthio camelus). Considered the largest bird in the world, the adult individuals of this flightless species can measure 2.4 m tall and weigh about 140 kg. In fact, such are the dimensions of this species of flightless bird that the eggs can weigh on average 1 kg.

Leatherback turtle

Another reptile that deserves a place on this list is the famous leatherback turtle (Dermochelys coriacea), the species of largest turtle in the world. It is a sea turtle that is also called the giant sea turtle or leatherback turtle and is considered the largest in size with quite a difference from the other species, since it can weigh more than 600 kg and can go up to 2.5 meters of length.

According to the IUCN Red List of Threatened Species, it is in a state of vulnerable (VU) to extinction. Here you can read more about the question: Is the leatherback turtle in danger of extinction?

Goliath tarantula

The Goliath tarantula, also called the giant or aviary tarantula (Theraphosa blondi) is considered the largest arachnid that exists. This arthropod, which can measure 30 cm -equivalent to the height of an A4-size paper- is capable, due to its large size, of feeding on small insects, lizards, rodents and even some birds, for which it receives the name of aviary tarantula. Although it may not seem like a very large animal at first glance and comparing it with others on this list it is small, taking into account that it is a spider, we can say that it is huge.

If you like this type of curious classifications of animals, we encourage you to read these other articles about 25 Animals with Big Eyes and The Most Dangerous Marine Animals in the World.

If you want to read more articles similar to Largest animals in the world, we recommend that you enter our category of Animal Curiosities.

  1. Vernimmen, Tim. (May 3, 2022). National Geographic. They discover the fossil of a 26-meter blue whale, the largest to date. Retrieved from: https://www.nationalgeographic.es/animales/2019/05/descubren-el-fosil-de-una-ballena-azul-de-26-metro-el-mas-grande-hasta-la-fecha
  2. Rodrigo Vasquez Carvallo. BLUE FIN: ANTARCTIC MAMMAL. Retrieved from: http://www.antarticarepositorio.umag.cl/bitstream/handle/20.500.11894/991/Vasquez%20Carvallo%20R._%20La%20ballena%20azul_2015.pdf?sequence=1&isAllowed=y
  3. Secretary of State for the Environment. Directorate General for the Sustainability of the Coast and the Sea. Division for the Protection of the Sea. Government of Spain. Balaenoptera physalus. Retrieved from: https://www.miteco.gob.es/es/costas/temas/proteccion-medio-marino/8358_roncual_comun_tcm30-162421.pdf
  • IUCN Red List of Threatened Species. Available at: https://www.iucnredlist.org/
  • Drafting of National Geographic Spain. (July 31, 2022). National Geographic Spain. Lion's mane. Recovered from: https://www.nationalgeographic.com.es/fotografia/foto-del-dia/medusa-crin-leon_13007
  • Wandrey, R. Cetaceans Species, habitat, behavior. NGV.
  • Editorial National Geographic Spain. (2010, September 5). National Geographic Spain. Sperm whale Recovered from: https://www.nationalgeographic.es/animales/cachalote
  • Staff of the World Wildlife Fund (WWF). (2022). World Wildlife Fund (WWF). SPECIES AND HABITATS: WHALE SHARK. Discover the whale shark: the largest fish in the world. Recovered from: https://www.wwf.es/nuestro_trabajo/especies_y_habitats/tiburon_ballena/
  • Staff of the World Wildlife Fund (WWF). (2022). World Wildlife Fund (WWF). 9 surprising facts about elephants. Recovered from: https://www.worldwildlife.org/descubre-wwf/historias/9-datos-sorprendentes-sobre-los-elefantes
  • Drafting of National Geographic Spain. (September 5, 20220). National Geographic Spain. Nile Crocodile. Recovered from: https://www.nationalgeographic.es/animales/cocodrilo-del-nilo
  • Staff of the World Wildlife Fund (WWF). (2022). World Wildlife Fund (WWF). SPECIES AND HABITATS: POLAR BEAR. The king of the Arctic is left homeless. Recovered from: https://www.wwf.es/nuestro_trabajo/especies_y_habitats/oso_polar/
You will help the development of the site, sharing the page with your friends
This page in other languages: