Animal Encyclopedia With Facts, Pictures, Stories, and More!

In the classical era, Aristotle divided animals,d based on his own observations, into those with blood (roughly, the vertebrates) and those without. The chordates are dominated by the vertebrates (animals with backbones), which consist of fishes, amphibians, reptiles, birds, and mammals. Most protostomes have schizocoelous development, where cells simply fill in the interior of the gastrula to form the mesoderm. Most appear to belong to two major lineages, the protostomes and the deuterostomes.
The earliest works of Japanese literature include the Kojiki and Nihon Shoki chronicles and the Man’yōshū poetry anthology, all from the 8th century and written in Chinese characters. Japan has the lowest rate of heart disease in the OECD, and the lowest level of dementia among developed countries. Since 1981, the principal cause of death in Japan is cancer, which accounted for 27% of the total deaths in 2018—followed by cardiovascular diseases, which led to 15% of the deaths.
For example, adult echinoderms are radially symmetric (unlike their larvae), while some parasitic worms have extremely simplified body structures. Many bilaterian phyla have primary larvae which swim with cilia and have an apical organ containing sensory cells. They also have a gut that extends through the basically cylindrical body from mouth to anus. Many bilaterians have a combination of circular muscles that constrict the body, making it longer, and an opposing set of longitudinal muscles, that shorten the body; these enable soft-bodied animals with a hydrostatic skeleton to move by peristalsis.

Modern era

The Japanese archipelago consists of four major islands alongside over 14,000 smaller islands. Located in the Pacific Ocean off the northeast coast of the Asian mainland, it is bordered to the west by the Sea of Japan, the Sea of Okhotsk in the north, and the East China Sea in the south. A fish is adapted to its life in water and a crab is adapted to a life catching and eating insects.

Numbers and habitats of major phyla

The scarab beetle was sacred in ancient Egypt, and the cow is basswin sacred in Hinduism. People have used hunting dogs to help chase down and retrieve animals, and birds of prey to catch birds and mammals, while tethered cormorants have been used to catch fish. The protostomes include the Ecdysozoa, named after their shared trait of ecdysis, growth by moulting, Among the largest ecdysozoan phyla are the arthropods and the nematodes. The remaining animals, the great majority—comprising some 29 phyla and over a million species—form the Bilateria clade, which have a bilaterally symmetric body plan.
However, these estimates are based on people affiliated with a temple, rather than the number of true believers. Japanese Sign Language is the primary sign language used in Japan and has gained some official recognition, but its usage has been historically hindered by discriminatory policies and a lack of educational support. English has taken a major role in Japan as a business and international link language, and is a compulsory subject at the junior and senior high school levels. Japanese writing uses kanji (Chinese characters) and two sets of kana (syllabaries based on cursive script and radicals used by kanji), as well as the Latin alphabet and Arabic numerals. The Japanese language is Japan’s de facto national language and the primary written and spoken language of most people in the country.

Foreign relations

Having a front end means that this part of the body encounters stimuli, such as food, favouring cephalisation, the development of a head with sense organs and a mouth. The digestive chamber has two openings, a mouth and an anus, and in the Nephrozoa there is an internal body cavity, a coelom or pseudocoelom. Most members of Medusozoa, including jellyfish and most hydrozoans, have a polyp form as well, but also have a motile medusae stage. Members of the group Anthozoa, such as sea anemones, coral, and sea pens only are sessile polyps. Sponges lack the complex organisation found in most other animal phyla; their cells are differentiated, but in most cases not organised into distinct tissues, unlike all other animals.

Law enforcement

Japan is the second highest-ranked Asian country in the 2025 Global Peace Index. Japan has close economic and military relations with the United States, with which it maintains a security alliance. Statutory law originates in the legislature, and the constitution requires that the emperor promulgate legislation passed by the Diet without giving him the power to oppose legislation.

• Japan is a unitary state and constitutional monarchy in which the power of the emperor (Tennō) is limited to a ceremonial role.
• Since the late 19th century, the judicial system has been largely based on the civil law of Europe, notably Germany.
• Karate, which originated in the Ryukyu Kingdom, is popular across the world and has been included in the Olympic Games.
• In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi) are held in place by cell walls, and so develop by progressive growth.
• The country attracted 36.9 million international tourists in 2024, and was ranked eleventh in the world in 2019 for inbound tourism.
• For sexual reproduction, most sponges are hermaphrodites, they produce both egg and sperm cells.

Animals that eat both plants and meat are called omnivores. Other animals eat only meat and are called carnivores. Some animals eat only plants; they are called herbivores. The animal mode of nutrition is called heterotrophic because they get their food from other living organisms. Also, the cells of animals have different cell membranes to other eukaryotes like plants and fungi.

• The country hosted the official 2006 Basketball World Championship and co-hosted the 2023 Basketball World Championship.
• The Zen school of Buddhism was introduced from China in the Kamakura period (1185–1333) and became popular among the samurai class.
• The Porifera (sponges) have long been assumed to be sister to the rest of the animals, but there is evidence that the Ctenophora may be in that position.
• More recent major quakes are the 1995 Great Hanshin earthquake and the 2011 Tōhoku earthquake, which triggered a large tsunami.
• Major animal paintings include Albrecht Dürer’s 1515 The Rhinoceros, and George Stubbs’s c.
• The Japan Aerospace Exploration Agency is Japan’s national space agency; it conducts space, planetary, and aviation research, and leads development of rockets and satellites.
• Public holidays in Japan are regulated by the Public Holiday Law (国民の祝日に関する法律, Kokumin no Shukujitsu ni Kansuru Hōritsu) of 1948.

In contrast, the cells of other multicellular organisms (primarily algae, plants, and fungi) are held in place by cell walls, and so develop by progressive growth. Development in Bilateria and Cnidaria is controlled by Hox genes, which signal the times and places to develop structures such as body segments and limbs. The biological definition includes all members of the kingdom Animalia. Non-human animals are also an important element of human culture, having appeared in cave arts and totems since the earliest times, and are frequently featured in mythology, religion, arts, literature, heraldry, politics, and sports.
The Pacific coast features a humid subtropical climate that experiences milder winters with occasional snowfall and hot, humid summers because of the southeast seasonal wind. The mountains of the Chūgoku and Shikoku regions shelter the Seto Inland Sea from seasonal winds, bringing mild weather year-round. The northernmost region, Hokkaido, has a humid continental climate with long, cold winters and very warm to cool summers. The climate of Japan is predominantly temperate but varies greatly from north to south. It has the 17th highest natural disaster risk as measured in the 2016 World Risk Index.