Animals

Impala (Aepyceros melampus): Overview, Behavior, and Conservation Impala Medium-sized African antelope (Aepyceros melampus) known for agility, mixed feeding and adaptable social systems. Widespread in savannas and woodlands; generally common but regiona…

Incisivosaurus: a small, tooth-specialized theropod from the Early Cretaceous Incisivosaurus Incisivosaurus is a small Early Cretaceous theropod from Liaoning, China, notable for rodent-like front teeth and probable herbivorous or omnivorous habits; known from well-preserv…

Indian cobra (Naja naja) — spectacled cobra of the Indian subcontinent Indian Cobra The Indian cobra (Naja naja) is a venomous snake native to South Asia, known for its hood, cultural significance, and role among the 'big four' snakes responsible for most bites in…

Indian cormorant (Phalacrocorax fuscicollis) Indian cormorant Medium-sized cormorant of the Indian subcontinent and Southeast Asia; a gregarious, fish-eating waterbird with a distinctive sloping forehead, blue eye and hooked bill.

Indian elephant (Elephas maximus indicus) Indian elephant Subspecies of the Asian elephant native to mainland South and Southeast Asia; endangered due to habitat loss, fragmentation and human–elephant conflict, and important in regional c…

Bengal fox (Vulpes bengalensis): ecology, distribution, and conservation Indian fox Overview of the Bengal fox (Vulpes bengalensis), the Indian fox: ecology, distribution across the South Asian subcontinent, behavior, threats and conservation measures to protect f…

Indian rhinoceros (Rhinoceros unicornis) Indian rhinoceros Large one‑horned rhinoceros of the Indian subcontinent, known for armour‑like skin and grassland habitats; conservation progress contrasts with threats from habitat loss and illega…

Indian roller (Coracias benghalensis): appearance, behavior, and range Indian roller A colourful woodland and grassland bird of tropical Asia, the Indian roller (Coracias benghalensis) is noted for its blue wings, perch‑hunting habits and dramatic aerial displays d…

Indian softshell turtle (Nilssonia gangetica) Indian softshell turtle A freshwater turtle of South Asia with a flat, flexible carapace. Found in major rivers, it is carnivorous and culturally important but faces habitat loss, hunting and trade threat…

Indochinese tiger (Panthera tigris corbetti): range, traits and conservation Indochinese tiger A continental tiger subspecies native to mainland Southeast Asia and southwestern China. Overview of appearance, habitat, threats, conservation efforts and taxonomic notes.

Indohyus — an Eocene artiodactyl with semiaquatic adaptations linked to whales Indohyus Indohyus was a small, deerlike Eocene artiodactyl from Kashmir whose dense bones and skeletal traits link it to early whales, offering insight into the transition from land to wate…

Ingerophrynus: Southeast Asian true toads Ingerophrynus Ingerophrynus is a small genus of Southeast Asian true toads, separated from Bufo and including species such as the recently described Ingerophrynus gollum; found across Sundaland…

Inland taipan (Oxyuranus microlepidotus) Inland taipan A compact profile of the inland taipan, the most venomous snake by venom toxicity; covering appearance, behavior, habitat, diet, medical significance and distinctions within Austra…

Insects (Insecta): Overview, Anatomy, Diversity and Importance Insect Concise encyclopedia entry on insects (class Insecta): defining traits, body plan, life cycles, diversity, ecological roles, human interactions, and distinctions like true bugs and…

Inuka — Singapore Zoo's Polar Bear (1990–2018) Inuka Inuka was a male polar bear born at Singapore Zoo in 1990, known as the first polar bear born in the tropics and a long-serving public mascot until his euthanasia in 2018.

Invertebrate — animals without a backbone Invertebrate Animals that lack a vertebral column; a diverse assemblage including arthropods, molluscs, cnidarians, worms, sponges, echinoderms and many other phyla.

Iphiclides — genus of swallowtail butterflies Iphiclides Iphiclides is a small genus of swallowtail butterflies (Papilionidae) known for pale yellow wings with black stripes and tail-like hindwing extensions; includes the scarce swallowt…

Iridescent shark (Pangasianodon hypophthalmus): freshwater catfish used for food and aquaria Iridescent shark A Southeast Asian freshwater catfish commonly called the iridescent shark; valued in aquaculture and aquarium trade, native to the Mekong and Chao Phraya basins and marketed intern…

Irish elk (Megaloceros giganteus) — giant deer of Eurasia Irish elk Extinct giant deer known for enormous palmate antlers. Lived across Eurasia until the early Holocene; many well-preserved skeletons come from Irish bogs. Extinction likely from com…

Irish Setter: appearance, history, temperament and care Irish Setter An overview of the Irish Setter: appearance, origins, behavior, common uses, grooming and health considerations for this energetic red-coated gundog breed.

Irritator — a spinosaurid theropod from the Early Cretaceous of Brazil Irritator Irritator is a spinosaurid theropod known from the Lower Cretaceous Romualdo Formation of Brazil. Noted for a long, narrow snout, conical teeth and a distinctive nasal crest, its f…

Irukandji jellyfish (Carukia barnesi) — tiny box jellyfish and Irukandji syndrome Irukandji jellyfish Concise encyclopedic overview of the Irukandji jellyfish (Carukia barnesi): appearance, venom and Irukandji syndrome, discovery, ecology, risks to swimmers, first aid, treatment an…

Isopod: diversity, anatomy, ecology, and human relevance Isopod Isopods are a diverse order of crustaceans (Isopoda) found in marine, freshwater, and terrestrial habitats; they include woodlice, pill bugs, parasitic and deep-sea forms and play…

Isurus — the mako sharks Isurus Isurus is the genus of mako sharks (family Lamnidae): streamlined, fast pelagic predators with two living species, a long fossil record, and growing conservation concerns from fish…

Ivory: Composition, Historical Uses, and Conservation of Animal Tusk Material Ivory Ivory: composition and sources (elephant, walrus, mammoth), historic uses in art and everyday objects, and contemporary conservation efforts, trade restrictions, legal issues, and…

Jabiru (Jabiru mycteria): large American stork and wetland specialist Jabiru Overview of the Jabiru stork (Jabiru mycteria): identification, range from Mexico to Argentina, habitat, behavior, reproduction, conservation status and cultural notes.

Jack Russell Terrier Small, energetic hunting terrier developed in England; chiefly white-coated with several coat types, high prey drive, used for foxing, earthwork, agility and as an active companion…

Jackal: natural history, behavior, species, and human interactions Jackal Medium-sized canids of Africa and Asia known for opportunistic feeding, monogamous pairs, and important ecological and cultural roles; includes three commonly recognised species.

Jackdaw (Corvus monedula) Jackdaw A compact, social member of the crow family found across Europe and parts of Asia; noted for its grey nape, pale eyes, intelligence and adaptable urban habits.

Jackson's chameleon (Trioceros jacksonii) Jackson's chameleon A medium-sized, horned chameleon native to East African forests, known for its three horns on males, arboreal habits, insect diet, live birth, and introduced populations in parts o…

Jagdterrier (Deutscher Jagdterrier) — German hunting terrier Jagdterrier Deutscher Jagdterrier, commonly Jagdterrier, is a small-to-medium German hunting terrier bred for versatility, stamina and bold pursuit of quarry. Known for high prey drive, strong…

Janenschia — Late Jurassic sauropod from the Tendaguru Beds Janenschia Janenschia is a large herbivorous sauropod from the Late Jurassic Tendaguru deposits of Tanzania. Known from fragmentary remains, its classification and anatomy have been debated b…

Japanese Bobtail: short-tailed domestic cat from Japan Japanese Bobtail The Japanese Bobtail is a domestic cat breed noted for its distinctive short, kinked tail, lively temperament, and cultural role in Japan, including its association with the lucky…

Japanese dormouse (Glirulus japonicus) Japanese dormouse Small nocturnal rodent endemic to Japan, arboreal and unique for running upside down beneath branches; feeds largely on nectar and pollen and occupies temperate forests.

Japanese macaque (snow monkey) Japanese macaque A comprehensive overview of the Japanese macaque (Macaca fuscata), its appearance, behavior, habitat in Japan, social life, use of hot springs, and conservation and cultural signif…

Japanese spider crab (Macrocheira kaempferi) Japanese spider crab A large deep-water crab native to the seas around Japan, notable for having the longest leg span of any arthropod. A scavenger with distinctive morphology, occasional cultural and…

Javan hawk-eagle (Nisaetus bartelsi): endemic forest raptor of Java Javan hawk-eagle Endemic crested raptor of Java, the Javan hawk-eagle (Nisaetus bartelsi) inhabits mature forests, preys on birds and small vertebrates, and is culturally significant as Indonesia’s…

Javan rhinoceros (Rhinoceros sondaicus) Javan rhinoceros Critically Endangered single-horned rhinoceros native to Southeast Asia, now confined to a small population in western Java; threatened by habitat loss, poaching and stochastic ris…

Jay (Corvidae bird) Jay Jays are medium-sized, often colorful corvids known for loud calls, intelligence, omnivorous diets and habit of caching seeds; they occur across Eurasia and the Americas and play r…

Jellyfish: biology, diversity, ecology, and human interactions Jellyfish Overview of jellyfish—medusozoan cnidarians—covering anatomy, life cycle, classification, ecology, stings, uses, and notable species with links to related topics.

Jentink's dormouse (Graphiurus crassicaudatus) Jentink's dormouse A small African dormouse in the family Gliridae, native to West and parts of Central Africa; arboreal and nocturnal, largely associated with moist lowland forest and little-known i…

Jerboa: the long‑legged desert rodent Jerboa Small, bipedal rodents of arid Asia and North Africa known for long hind legs, jumping locomotion, nocturnal burrowing behavior, and key ecological roles as seed eaters and prey sp…

Jigglypuff: overview, appearance, abilities, history and cultural role Jigglypuff Jigglypuff (Japanese: Purin) is a pink, balloon-like Pokémon known for its sleep-inducing song, frequent appearances in the anime and games, and its role in popular culture and mer…

Jobi manucode (Manucodia jobiensis) Jobi manucode A medium-sized, glossy bird-of-paradise from Jobi Island and northern New Guinea; frugivore-insectivore, relatively common, with crow-like silhouette, red eyes, and distinctive voc…

Johnston's African dormouse A small nocturnal rodent of the Gliridae family found in parts of southeastern Africa; inhabits moist savanna and woodland edges and is little studied in the wild.

Josephoartigasia — extinct giant South American rodent Josephoartigasia Extinct South American genus of giant rodent, including Josephoartigasia monesi. Known for very large skulls and incisors, debated body-mass estimates, and a relation to modern pac…

Jumping Spider (Salticidae): Overview, Behavior, and Distribution Jumping spider Jumping spiders (Salticidae) are active, visually acute hunters found worldwide except Antarctica. About 5,000 described species inhabit diverse habitats and capture prey by leapin…

Jungle cat (Felis chaus) Jungle cat A medium-sized wild felid of the genus Felis, the jungle cat inhabits wetlands and grasslands from Egypt to China; adaptable, largely solitary, and classified Least Concern.