Species of the day Orycteropus afer Wildlife encyclopedia A detailed guide to the animal kingdom Explore animals by habitat, diet, behaviour, conservation status, and scientific classification across the animal kingdom. 811 published species · Mammals , Birds , Reptiles , Amphibians What you can learn in this animal encyclopedia Animal Information is a growing wildlife reference for people who want clear species facts in one place. Each published animal page brings together common and scientific names, taxonomy, habitat and diet, behaviour notes, conservation status, measurements, and media when available. You can browse animal groups , walk scientific classification from kingdom to species, filter by shared traits , or open the A–Z index when you already know a name. Longer wildlife articles connect species, places, and ideas beyond a single record. Amphibians Axolotl Ambystoma mexicanum Ambystoma mexicanum Mammals Aye-Aye Daubentonia madagascariensis Daubentonia madagascariensis Fish Atlantic Wolffish Anarhichas lupus Atlantic Wolffish Anarhichas lupus Fish Atlantic Salmon Salmo salar Atlantic Salmon Fish Atlantic Bluefin Tuna Thunnus thynnus Atlantic Bluefin Tuna Thunnus thynnus Birds Atlantic Puffin Fratercula arctica Atlantic Puffin Fratercula arctica Birds Andean Condor Vultur gryphus Reptiles Araxes Tortoise Testudo graeca armeniaca Araxes Tortoise Testudo graeca armeniaca Mammals Arizona Black-Tailed Prairie Dog Cynomys ludovicianus Arizona Black-Tailed Prairie Dog Cynomys ludovicianus Fish American Leg Skate Anacanthobatis americanus American Leg Skate Anacanthobatis americanus Reptiles Asp Viper Vipera aspis Mammals Arctic Fox Vulpes lagopus Mammals 260 species Warm-blooded vertebrates with hair or fur, and usually live young. Example · Aye-Aye Birds 207 species Feathered, egg-laying vertebrates built for flight, or for life on land and water. Example · Atlantic Puffin Reptiles 142 species Scaly vertebrates such as snakes, lizards, turtles, and crocodilians. Example · Araxes Tortoise Amphibians 42 species Frogs, salamanders, and kin that often split life between water and land. Example · Axolotl Fish 94 species Aquatic vertebrates that breathe with gills, from reefs to deep ocean. Example · Atlantic Wolffish Insects 33 species Six-legged arthropods — beetles, butterflies, ants, and countless others. Example · Amazon Darner

Crustaceans 1 species Mostly aquatic arthropods such as crabs, shrimp, and lobsters. Molluscs 24 species Soft-bodied animals including snails, octopuses, clams, and squid. Example · American Keeled Slug Echinoderms 1 species Sea stars, urchins, and kin with a radial body plan. Cnidarians 1 species Jellyfish, corals, and anemones that use stinging cells. Annelids 3 species Segmented worms such as earthworms and many marine species. Example · Aquatic Oligochaete Worm Other 3 species Published species that sit outside the main group list. Example · Chinese Jumper Open the full explore map → Activity pattern When animals are usually awake — by day, by night, or around dawn and dusk. Browse · Active · Cathemeral · Crepuscular · Diurnal View all activity pattern → Activity pattern When animals are usually awake — by day, by night, or around dawn and dusk. Browse · Active · Cathemeral · Crepuscular · Diurnal View all activity pattern → Behaviour How animals act — hunting, resting, migrating, courting, and looking after young. Browse · Foraging · Hunting in Groups · Resting During Daylight · Solitary View all behaviour → How animals act — hunting, resting, migrating, courting, and looking after young. Browse · Foraging · Hunting in Groups · Resting During Daylight · Solitary View all behaviour → Biogeographic realms Huge natural regions of the world that share related plants and animals — sometimes called ecozones. Browse · Afrotropical · Antarctic · Australasian · Indomalayan View all biogeographic realms → Biogeographic realms Huge natural regions of the world that share related plants and animals — sometimes called ecozones. Browse · Afrotropical · Antarctic · Australasian · Indomalayan View all biogeographic realms → Birth type Eggs, live young, and the other ways animals bring offspring into the world. Browse · Egg-laying · Live birth · Metamorphosis · Ovoviviparous View all birth type → Eggs, live young, and the other ways animals bring offspring into the world. Browse · Egg-laying · Live birth · Metamorphosis · Ovoviviparous View all birth type → Browse the full trait catalog → 4 Sept 2026 What is the Fastest Land Animal? Discover the cheetah, the fastest land animal, its remarkable speed, adaptations, and comparisons with other swift runners in the animal kingdom. Read article → What is the Fastest Land Animal? Discover the cheetah, the fastest land animal, its remarkable speed, adaptations, and comparisons with other swift runners in the animal kingdom. A–Z animal index Browse every published common name in alphabetical order, then open the full letter list. A–Z animal index Browse every published common name in alphabetical order, then open the full letter list. Animal sounds Listen to species vocalizations collected with the rest of each animal record. Listen to species vocalizations collected with the rest of each animal record. Compare species Put two animals side by side on traits, measurements, and conservation notes. Compare species Put two animals side by side on traits, measurements, and conservation notes. Trait catalog Explore shared habitats, diets, lifestyles, and other filters across the kingdom. Explore shared habitats, diets, lifestyles, and other filters across the kingdom. Alongside taxonomy, species records can include habitat, diet, behaviour, conservation notes, photos, vocalizations, fun facts, and FAQ answers shaped from real visitor questions. Begin at Kingdom → Find the next species in the animal kingdom Search a name you know, or wander groups and traits until something unfamiliar catches your eye.