Animals/Wildlife: Most Popular Articles
Facts about owls, a group of birds known for their distinct calls, nocturnal habits, and silent flight.
An introduction to the six basic groups of animals including amphibians, birds, fishes, invertebrates, mammals, and reptiles.
All living organisms can be sorted into one of two groups depending on the fundamental structure of their cells - prokaryotes or eukaryotes.
A list of my top ten favorite conservation organizations that work to protect animals and wildlife around the world.
It's easy to feel overwhelmed in the face of species loss and habitat destruction. Here is a list of things you can do to help protect wildlife.
An A to Z list of animal profiles available in The Animal Encyclopedia, sorted alphabetically by scientific name.
Learn about the key characteristics of animals including multicellularity, eukaryotic cells, sexual reproduction, movement, and more.
The following is an A to Z list of mammal profiles available, sorted alphabetically by common name.
An introduction to six basic groups of invertebrates including arthropods, cnidarians, echinoderms, mollusks, segmented worms, and sponges.
Facts about birds, a group of vertebrates that includes nearly 10,000 species that are unique for their feathers and furculas, also know as wishbones.
Learn interesting facts about mammals and find out about their diversity, evolutionary history and the characteristics make them different from other animal groups.
A list of some of the animals that inhabit North America including the nine-banded armadillo, tufted titmouse, caribou, monarch butterfly, and more.
A list of some of the animals that inhabit the Great Barrier Reef including sea birds, mollusks, marine mammals, marine reptiles, and more.
A list of the largest species in each group of mammals that inhabit our planet today.
Mammals display a remarkable array of adaptations, some of which (hair, mammary glands, specialized ear bones) are shared by no other animal groups.
Learn interesting facts about invertebrates, a group of animals that accounts for 97 percent of all known species.
Learn interesting facts about dolphins and find out about the characteristics make them different from other animal groups, their life cycle and their evolutionary history.
Profile of arthropods, a group of invertebrates that includes insects, spiders, crustaceans, scorpions, centipedes, and many others.
An introduction to the basic mammal groups including aardvarks, bats, carnivores, cetaceans, elephants, marsupials, primates, rodents, and many others.
An A to Z list of animal profiles available in The Animal Encyclopedia, sorted alphabetically by common name.
Definition of a niche, a term used to describe the role an organism or population plays within its community or ecosystem.
Great horned owls are a large species of true owls that inhabits many parts of North and South America.
Cnidarians are diverse and come in many shapes and sizes but there are some basic anatomical features that most members of the group share in common.
Facts about bears, a group of carnivores known for their burly build, impressive agility and, in some species, their winter sleep habits.
Facts about giraffes, a group of mammals that are best known for their tall profile, long neck, and the distinct patchwork pattern of their fur.
Learn facts about frogs and find out about their diversity, evolutionary history and the characteristics make them different from other vertebrates.
Molluscs are a group of invertebrates that includes squids, octopuses, cuttlefishes, nudibranchs, snails, slugs, limpets, mussels, and many more.
A list of animals of the Amazon River basin in South America including harpy eagles, three-toed sloths, toucans, and more.
Descent with modification refers to the passing on of traits from parent organisms to their offspring.
Mammals are a group of tetrapods that includes bats, carnivores, cetaceans, elephants, hoofed mammals, primates, monotremes, marsupials, and rodents.
Jellyfish get a lot of negative press for the threats they can pose to swimmers and holiday makers visiting beaches around the world.
Reptiles are cold-blooded vertebrates that diverged from ancestral amphibians about 340 million years ago.
Explore the basic characteristics that are shared by all reptiles—from snakes and lizards to crocodiles and turtles.
Octopuses are known for their intelligence, their uncanny ability to blend into their surroundings and the unique way they get around.
Endangered animals are species or populations that are at risk of becoming extinct.
Learn interesting facts about arthropods, a group of invertebrates that have an exoskeleton and a segmented body.
In this photographic guide, find out more about cats, their classification, adaptations, and natural history.
Definition of endangered species, a term used to refer to a species in danger of extinction throughout all or a significant portion of its range.
Definition of habitat destruction, a term that is used to describe the process by which natural habitat is damaged or destroyed.
The life cycle of a frog includes three stages: egg, larva, and adult. This article explores the developmental changes a frog experiences in its life.
A brief overview of the history of life from the time the first life evolved until the present day. Page 2.
Snowy owls are large owls with white plumage and their extreme northerly range which includes tundra habitat throughout Alaska, Canada and Eurasia.
A keystone species is a species that plays a critical role in the structure of an ecological community and whose influence is greater than expected.
An introduction to the three basic groups of amphibians including salamanders and newts, caecilians, and frogs and toads.
Turtle eating habits are varied--what they eat depends on the available food sources, the habitat in which the turtle lives and the turtle's behavior.
Tigers are the largest and most powerful of all cats. Tigers have a distinct orange coat, black stripes and white markings.
Molluscs are a group of invertebrates known for their remarkable diversity—both sheer number of species as well as variety of form.
The most recognized image of a jellyfish is that of the adult jellyfish, with its bell-shaped body and long tentacles.
Animals' bodies are made up of various organ systems, groups of organs that work together to perform a function.
Animals are multicellular organisms that are capable of locomotion and that rely on other organisms to obtain their nourishment.
One criteria by which all animals are described is whether or not they have a backbone. This article explores facts about vertebrates and invertebrates.
The natural world is characterized by many complex interactions. Individuals belong, in turn, to populations, species, communities, and ecosystems.
Definition of lion pride, a term that refers to a group of line that typically includes about five females and two males and their young.
Find out how scientists estimate and count the many millions of animal species that live on our planet today.
Sexual dimorphism is the difference in form between male and female members of the same species.
The aquatic biome consists of habitats around the world that are dominated by water, from tropical reefs, to brackish mangroves, to Arctic lakes.
Carnivores are a group of mammals that includes dogs and their relatives, bears, racoons, mustelids, civits, hyenas, aardwolf, and cats.
Second page of 10-part introduction on cats. This part discusses traits, like claws, of the cat that make them adapt to many environments.
Learn interesting facts about animals and find out about the characteristics make them different from other groups of living organisms.
Chordates are a group of animals that includes more than 75,000 species. Chordates are divided into three groups: vertebrates, tunicates, lancelets.
Facts about zebras, a group of equids with a distinct black and white striping pattern.
The lion is a species of large cat that has a buff colored coat, white underparts, and a long tail that ends in a black tuft of fur.
Profile of the deciduous forest, a type of forest in which the trees shed their leaves during the cold months of the year.
Molluscs are invertebrates that include animals such as squid, octopuses, cuttlefish, nudibranchs, snails, slugs, limpets, sea hares, mussels, clams, oysters, scallops, as well as many lesser known creatures.
Profile of insects, a highly successful group of animals that accounts for more species of animals than any other class of animals.
An introduction to the 30 basic groups of birds including birds of prey, buttonquails, gamebirds, herons, hummingbirds, owls, rheas, and many others.
Learn interesting facts about marsupials and find out about the characteristics make them different from other animal groups, their life cycle and their evolutionary history.
Net primary production (NPP) is the total energy (or nutrients) accumulated by an ecological unit of interest (such as an organism, a population, or an entire community).
Profile of the Appalachian Mountain Range, an ancient band of mountains that stretches in a southwestern arc from Newfoundland to Alabama.
Cats belong to the group of vertebrates known as mammals. Within the mammals cats are classified with other meat eaters in the Order Carnivora (known commonly as 'carnivores'). Page 3.
An introduction to the four basic groups of reptiles including crocodilians, lizards, snakes and turtles.
Reptiles are a group of vertebrates that colonized terrestrial habitats more extensively than their amphibian ancestors.
A heterotroph is an organism that is unable to obtain its carbon from carbon dioxide. Instead, heterotrophs obtain carbon from organic material such as other organisms, living or dead.
Echinoderms are a group of marine invertebrates that includes star fish, sea lilies, feather stars, brittle stars, sea cucumbers and sea urchins.
Populations are groups of individuals belonging to the same species that live in a shared region at the same time.
Of all animals, birds are among the most varied in color, shape and size. In this gallery we'll catch a glimpse of a small handful of the many birds that can claim to be the cutest of their kind.
Bird characteristics include numerous adaptations for flight such as feathers, a furcula and hollow bones.
Learn interesting facts about fishes and find out about their diversity, evolutionary history and the characteristics make them different from other animal groups.
An overview of vertebrate evolution that explores the key developments in the evolution of mammals, birds, reptiles, amphibians, and fish.
Sponges are a group of simple aquatic invertebrates that include glass sponges, demisponges, and calcareous sponges.
Jellyfish are a group of carnivorous cnidarians with a bell-shaped body and tentacles. Jellyfish are delicate, soft-bodied animals.
Canids are long-legged carnivores that include wolves, coyotes, jackals, foxes, wild dogs and domestic dogs.
Vipers are a group of snakes that include true vipers, bush vipers, rattlesnakes, pit vipers, adders and night adders.
Feathers are a unique adaptation of birds. Feathers are made up of keratin, an insoluble protein that is also found in mammalian hair and reptilian scales.
What reptiles eat differs from species to species but here you'll find out about some of the general dietary trends for various reptiles.
Living organisms face a constant barrage of external stresses or threats that challenge their ability to survive and reproduce.
Pictures of mammals, including mammal photos such as pronghorn, meerkats lions, koalas, hippopotamuses, dolphins and more.
Lions are the largest of all African cats. They are the second largest cat species worldwide, smaller than only the tiger. Lions range in color from nearly white to tawny yellow, ash brown, ochre, and deep orange-brown. They have a tuft of dark fur at the tip of their tail.
Learn interesting facts about frogs and find out about their diversity, evolutionary history and the what make them different from other amphibians.
Pictures of invertebrates including horseshoe crabs, jellyfish, ladybugs, snails, spiders, octopus, chambered nautiluses, mantises, and more.
Elephants are a group of mammals that are noted for their large size, massive skull, and long muscular trunk.
The cats of Africa include the caracal, serval, cheetah, lion, and leopard. Page 8.
The Nature Conservancy is a conservation group that works with governments, communities, and others to solve conservation challenges.
Endangered species are at risk of extinction due to threats such as habitat destruction, climate change, or the ill effects of invasive species.
Amphibians are a group of tetrapods that include modern-day frogs and toads, caecilians, and newts and salamanders.
A first step to understanding individual animals and populations of animals is to understand the relationship they have with their environment.
Cartilaginous fishes are a group of fishes that includes the largest and most formidable marine predators alive today: the sharks.
Put your animal identification skills to the test in this quiz.
The Arctic wolf is a subspecies of grey wolf that lives in the Canadian Arctic, Alaska, and northern Greenland.
The World Wildlife Fund is a global-scale conservation organization that works in 100 countries and consists of nearly 5 million members worldwide.
Biomes are large regions of the earth that share similar characteristics such as climate, soils, precipitation, plants, and animals.
Pictures of owls, including owl photos such as snowy owls, northern saw whet owls, great horned owls, barn owls and more.
Segmented worms are bilaterally symmetrical invertebrates that include more than 12,000 species such as earthworms, ragworms and leeches.
The term species can be defined as a group of individual organisms that are capable of interbreeding to produce fertile offspring in nature.
Birds are vertebrates that have four limbs, wings, feathers, hollow bones and other adaptations for an aerial lifestyle.
Snow leopards live in mountainous habitat at elevations of between 2000 and 6000 meters. Their range extends from northwestern China to Tibet and the Himalayas. Page 10.
Owls are a group of birds that have strong talons, a downward-curved bill, acute hearing, and keen eyesight.
An introduction to the basic fish groups including bony fishes and cartilaginous fishes.
Waves give rhythm to the ocean. They transport energy over vast distances. Where they make landfall, waves help to sculpt a unique and dynamic mosaic of coastal habitats.
The black rhinoceros is a critically endangered species of rhinoceros, It has poor eyesight but acute hearing and sense of smell.
Tigers are the largest and most powerful of all cats. They are extremely agile despite their bulk and can leap between 8 and 10 meters in a single bound. They are also among the most recognizable of cats thanks to their distinct orange coat, black stripes and white markings.
The Wildlife Conservation Society supports zoos and aquariums while promoting environmental education and conservation of wildlife and habitats.
The total energy (or nutrients) assimilated by an ecological unit (such as an organism, a population, or an entire community).
The Cheetah (Acinonyx jubatus) is a highly unusual cat that has numerous characteristics that set it apart from all other cats. Page 11.
Bats are the worlds only group of mammals that have wings.
Pictures of amphibians including red-eyed tree frogs, axolotl, green tree frogs, California newts, leopard frogs, and more.
The following is an A to Z list of mammal profiles available, sorted alphabetically by scientific name.
Mature forests often have several distinct layers including the forest floor, herb layer, shrub layer, understory, canopy, and emergents.
Starfish are a group of echinoderms that include about 1500 living species. Starfish have five or more arms that radiate outward from a central body disc.
The American black bear is a large carnivore that inhabits the forests, swamps, tundra throughout the more northerly reaches of North America.
Elephants' trunks are muscular, flexible extensions of their upper lip and nose. To drink, elephants suck water up into their trunk
A rain shadow is an area of dry land on the leeward side of a mountain. This profile explores the geography, habitat, and wildlife of rain shadows.
Scientists have identified nearly one million living species of invertebrates, but this is only a small fraction of the invertebrates alive today.
The identification of the various panthera species (or 'roaring cats') can be confusing but armed with a few facts, you can quickly narrow down the possibilities when trying to place a name with a cat. Page 9.
A guide to the different kinds of binocular technology and their many features and how to select what you need for quality, comfort, ease, and price.
To maintain correct body temperature, mammals must conserve body heat in cold conditions and dissipate extra body heat in warmer conditions.
Giant sequoias, blue whales, Komodo dragons, and African elephants all share the distinction of being among the world's largest organisms.
Wildlife species interact with each other in numerous, complex ways. Fortunately, we can make some general statements about these interactions.
Squamates are a group of reptiles that sheds their skin periodically in patches and have uniquely jointed skulls and jaws.
The European robin is a small perching bird that lives throughout Europe and is noted for its orange-red breast.
Definition of pentaradial, a term that describes a type of radial symmetry in which body parts are arranged along five rays of symmetry.
Snow leopards are mountain-dwelling cats that live throughout the ranges of South and Central Asia at altitudes between 9,800 and 16,500 feet. Snow leopards are classified as endangered and their population is declining due to habitat destruction and a dwindling prey base.
Zoology is the study of animals; yet this definition implies a simplicity that does not exist; instead, zoology is a complex discipline, drawing upon a diverse body of scientific observation and theory.
In some cat species, a melanistic or black color morph appears on occasion in a wild population. Although these melanistic individuals may look quite different from their kin, they are color variations, not separate species. Examples of such melanistic individuals include black leopards and black jaguars. This picture shows a black jaguar. Page 10.
Butterflies are a group of insects that include more than 15,000 species. Members of this group include swallowtail butterflies, birdwing butterflies, white butterflies, yellow butterflies, blue butterflies, copper butterflies, metalmark butterflies, brushfooted butterflies, and skippers. Page 2.
The American beaver is one of two living species of beavers and the world's second largest rodent, only the capybara of South America is larger.
During the Devonian Period, about 375 million years ago, a group of vertebrates clamoured their way out of the water and onto land.
In addition to melanistic individuals, some cat species also exhibit white color varieties. White tigers and white lions are two such examples. Neither white tigers nor white lions are albinos, but instead are white due to the presence of a recessive gene which causes their coat background color to be almost white instead of yellow. Page 11.
Bivalves are a group of molluscs that include clams, scallops, oysters, mussels, borers, trough shells and many others.
Jumping spiders are a group of arachnids that have eight eyes: four on the front of their head, two on the side, and two on the rear of their head.
To understand animals and their biology, it helps to understand the cells, tissues, organs and organ systems that comprise them.
The African elephant is the largest living land mammal and one three species of elephants alive today.
Pictures of birds including vultures, puffins, jays, cranes, sandgrouse, robins, gannets, plovers and more.
The term fish is used to refer to any aquatic vertebrate that has a skin covered with scales, two sets of paired fins, some unpaired fins, and a set of gills.
Temperate forests evolved 65 million years ago when global temperatures dropped and, in areas further from the equator, cooler climates emerged.
Pumas, also known as mountain lions, catamonts, panthers or cougars, are a large cat whose former range extended from coast to coast across North America. By 1960, they were declared extinct in most midwestern and eastern ranges. Page 7.
Profile of bony fishes, a group of vertebrates characterized by having a bony skeleton unlike the cartilaginous fishes whose skeleton consists of cartilage.
There are numerous lion subspecies and there is disagreement among experts as to which subspecies are recognized. Page 6.
In recent years, scientists and conservationists have been working to raise public awareness of a global decline in amphibian populations.
Prokaryotes are organisms made up of cells that lack a cell nucleus or any membrane-encased organelles.