Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from 8.5 micrometres (0.00033 in) to 33.6 metres (110 ft). They have complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology.
Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes, containing animals such as nematodes, arthropods, flatworms, annelids and molluscs, and the deuterostomes, containing the echinoderms and the chordates, the latter including the vertebrates. Life forms interpreted as early animals were present in the Ediacaran biota of the late Precambrian. Many modern animal phyla became clearly established in the fossil record as marine species during the Cambrian explosion, which began around 539 million years ago. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago.
Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological classification for animals in 1758 with his Systema Naturae, which Jean-Baptiste Lamarck expanded into 14 phyla by 1809. In 1874, Ernst Haeckel divided the animal kingdom into the multicellular Metazoa (now synonymous for Animalia) and the Protozoa, single-celled organisms no longer considered animals. In modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogenetics, which are effective at demonstrating the evolutionary relationships between taxa.
Humans make use of many animal species, such as for food (including meat, milk, and eggs), for materials (such as leather and wool), as pets, and as working animals including for transport. Dogs have been used in hunting, as have birds of prey, while many terrestrial and aquatic animals were hunted for sports. Nonhuman animals have appeared in art from the earliest times and are featured in mythology and religion.
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A screenshot of the sample identification card that the National Bureau of Investigation used to test the registration of SIM cards in different telecommunications companies.
MANILA, Philippines — Could a “monkey” register a subscriber identity module (SIM) card?
The answer is yes — at least...
You can hear a blue whale's heartbeat from two miles away
The blue whale is the largest animal on the planet, weighing up to 150 tons and measuring up to 90 feet long. Naturally, an animal this massive would have an equally huge heart. Roughly the size of a small car, the blue whale's heart...
10 INTERESTING FACTS ABOUT ANIMALS
A cat can’t climb head first down a tree because every claw on a cat’s paw points the same way. To get down from a tree, a cat must back down.
The Amur Leopard is a subspecies of leopard that has adapted to a cold and snowy environment. The wild population has...
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A Blue Whales tongue can weigh as much as a car, or a small ãdül† elephant.
Blue whales are the largest animals ever known to have lived on Earth. These magnificent marine mammals rule the oceans at up to 100 feet long and upwards of 200 tons. Their tongues alone can weigh as...
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The shortest living animal in the world is the Mayfly. Its entire ãdül† lifespan is just 24hrs.
The lifespan of a fly is short no matter what species you’re talking about, but the mayfly puts even the average lifespan of a fly to shame. These insects are the shortest living...
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Cheetahs are the world’s fastest land animal.
Cheetah's capable of reaching speeds of up to 70 mph. Standing at about 30 inches tall at the shoulder and weighing between 110 and 140 pounds, they have long, graceful legs; a small, rounded head on a long neck; a very flexible...
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A rhinoceros' horn is made of hair.
The horn of the rhinoceros is not a horn in the traditional sense like the horn of a cow or the nail of a hoof, though it does share some material properties. The rhino’s horn is actually a tuft of hair that grows, tightly packed and glued...
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The national animal of Scotland is the unicorn.
If we asked you ‘what’s Scotland’s national animal?’, you might ponder between a couple of our iconic wildlife species. You probably wouldn’t think of a magical horned creature typically seen on children’s lunchboxes!
But it’s...
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Albino animals are extremely rare and unusual. They have all the characteristics of others of their species except they are all white in color. Not one inch of their natural coloring comes through as their bodies are unable to produce a pigment known as melanin. Melanin creates the normal...
Whales belong to the order cetacea, which includes whales, dolphins and porpoises. Whales are divided into two suborders: baleen and toothed whales. Baleen whales have a comb-like fringe, called a baleen, on the upper jaw, which is used to filter plankton, as well as small fish and crustaceans...
Snakes are carnivores (meat eaters).
Snakes don’t have eyelids.
Snakes can’t bite food so have to swallow it whole.
Snakes have flexible jaws which allow them to eat prey bigger than their head!
Snakes are found on every continent of the world except Antarctica.
Snakes have internal...
You’ve probably heard all kinds of things about the honey badger and wondered, “Are these claims substantiated?” (First and foremost: Is it true that honey badgers don’t care?) Here are a few things we know for sure.
1. THEIR NAME MEANS “HONEY EATER OF THE CAPE.”
Mellivora capensis is the...