Animals
Articles about animal species, behavior and classification.
Ingerophrynus
Ingerophrynus: Southeast Asian true toads
Inland taipan
Insect
Insects (Insecta): Overview, Anatomy, Diversity and Importance
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
Invertebrate
Iphiclides
Iridescent shark
Irish elk
Irish elk (Megaloceros giganteus) — giant deer of Eurasia
Irish Setter
Irish Setter: appearance, history, temperament and care
Irritator
Irukandji jellyfish
Isopod
Isopod: diversity, anatomy, ecology, and human relevance
Isurus
Isurus — the mako sharks
Ivory
Ivory: Composition, Historical Uses, and Conservation of Animal Tusk Material
Jabiru
Jack Russell Terrier
Jackal
Jackal: natural history, behavior, species, and human interactions
Jackdaw
Jackdaw (Corvus monedula)
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
Jackson's chameleon (Trioceros jacksonii)
Jagdterrier
Jagdterrier (Deutscher Jagdterrier) — German hunting terrier
Janenschia
Japanese Bobtail
Japanese dormouse
Japanese macaque
Japanese macaque (snow monkey)
Japanese spider crab
Javan hawk-eagle
Javan hawk-eagle (Nisaetus bartelsi): endemic forest raptor of Java
Javan rhinoceros
Javan rhinoceros (Rhinoceros sondaicus)
Jay
Jellyfish
Jentink's dormouse
Jentink's dormouse (Graphiurus crassicaudatus)
Jerboa
Jerboa: the long‑legged desert rodent
Jigglypuff
Jobi manucode
Jobi manucode (Manucodia jobiensis)
Johnston's African dormouse
Josephoartigasia
Josephoartigasia — extinct giant South American rodent
Jumping spider
Jumping Spider (Salticidae): Overview, Behavior, and Distribution
Jungle cat
Junglefowl
Junglefowl (Genus Gallus): Species, Ecology, Behavior and Human Connections
Juramaia
Juramaia: Earliest Known Eutherian Mammal from the Late Jurassic
Justify (horse)
Justify (racehorse) — 2018 American Triple Crown winner
K-Run's Park Me In First
K-Run's Park Me In First (Uno) — 2008 Westminster Best in Show Beagle
Kabomani tapir
Kabomani tapir (Tapirus kabomani)
Kabul markhor
Kabul markhor (Capra falconeri megaceros)
Kakapo
Kakapo (Strigops habroptilus): New Zealand's flightless parrot
Kallima
Kallima — the oakleaf or dead‑leaf butterflies
Kangaroo
Kangaroo (Macropus) — overview, biology and significance
Kangaroo mouse
Kangaroo mouse (Microdipodops): desert-adapted hopping rodents
Kangaroo rat
Kangaroo rat (Dipodomys): desert‑adapted North American rodents