Welcome to Animalswiki, the online encyclopedia where you will have fun getting to know the animal world in a dynamic and entertaining way. You will find information about all the animals in the world. There are many interesting animals that you probably do not know, and what better way to discover everything about animals in this fun, light and ideal way to inspire class work.

You can discover all the information in a simple and complete way of all the existing animals by clicking on "Name of animals". You have a complete list from A to Z with the animals where you can easily access them (Remember that we update daily!). You will also have a list within the different sections, where we separate them according to their classification.

Animal names

List of all the animals in the world from A to Z

What is the animal kingdom?

The Animal Kingdom has the largest number of species among all the kingdoms. In fact, all the known species from the other four kingdoms could be added together and this figure would still be less than those found in the Animal Kingdom. Although the Animal Kingdom is very diverse, all organisms in this kingdom share three main characteristics: they depend on other animals and plants for food, they are mobile, and they are multicellular.

Most animals reproduce sexually and have sensory organs that allow them to hear, touch, see, taste, and smell. Many are made of millions of cells. These millions of cells can be divided into tissues according to their function. When there are many tissues working together, they form an organ. When the organ works with other organs in a common task, this is known as an organ system. These levels of organization are unique to the Animal Kingdom.

Because the Animal Kingdom is so large, it is subdivided into other categories that are further divided later. These subdivisions are based on the similar characteristics of the animals or their absence.

To organize them we have their basic structure that branches into:

  • Kingdom: It represents each of the great taxonomic subdivisions in which living beings are classified with respect to their evolutionary kinship.
  • Edge: It is a category in taxonomy located between the kingdom and the class, and used in the animal kingdoms (containing 35 phyla), fungi (containing 6), protists, and bacteria domain.
  • Class: It is a category in taxonomy, located between the edge or division and the order.
  • Order: It is the taxonomic category between class and family.
  • Family: It is a systematic unit and a taxonomic category situated between order and genus; or between the superfamily and the subfamily if they were described.
  • Gender: It is a taxonomic category that is located between the family and the species; thus, a genus is a group of organisms that in turn can be divided into several species (there are some genera that are monospecific, that is, they contain only one species).
  • Species: The basic unit of biological classification is called a species (from the Latin species). A species is a set of organisms or natural populations capable of interbreeding and producing fertile offspring, although —in principle— not with members of populations belonging to other species.

What is an animal?

There are characteristics by which we recognize animals - they are multicellular, they obtain the energy necessary for life by eating other organisms, and they can move and feel their environment - but these do not define an animal. In taxonomy, names are given to the branches of evolutionary trees. Real or "natural" groupings must encompass assemblages of organisms that have a common evolutionary ancestor. This means that the term "animal" must refer to a group of related species. Animals, therefore, are a natural group descended from a shared common ancestor. This natural group is called the Animal Kingdom, or Metazoa.

What are the most important species in the world?

The most important species for us, human beings, are those animals that provide us with the balance of the ecosystem.


Primates are our closest cousins. By studying them and observing their behavior, human beings have been able to gain remarkable insight into our own beginnings and how our complex cultures have developed.

Primates share more than 90% of our DNA. For chimpanzees, our closest relatives, the similarities in our genetic code have surprised even experts.

Primates are a keystone species in rainforests. They are the main seed dispersers, as they eat fruit and then dispense the seeds in small packets of fertilizer around the forest. We need to protect primates today to have forests tomorrow that can absorb carbon dioxide from the atmosphere and prevent soil erosion.


Bats are the only mammal capable of flight and are so highly evolved that they are able to locate a single insect flying in total darkness and lift it out of the air using echo localization.

For this reason they are an important predator of insects and play a key role in controlling the number of insects. They are also the most abundant mammal on the planet - one in five mammals is a bat.

Bees and butterflies

Without the bees, humans would starve. These industrious little insects are the world's largest pollinators, carrying pollen from flower to flower as they collect nectar for their hives. Millions of years of evolution have seen many plants rely almost entirely on bees to help them reproduce.

Butterflies perform the same role as bees, but they also predict climate change.

Crops like almonds, peaches, avocados, and apricots are totally dependent on pollination from bees and butterflies.


Plankton. A drifting soup of microscopic algae, creatures and bacteria, which are not even a group of species, but a bridge between entire taxonomic kingdoms. Plankton is essentially anything that lives in water that is too small to swim upstream, including krill and algae.

But despite their small size, plankton flowers are visible from space and can support billions of sea creatures. The plant-like organisms in plankton, known as phytoplankton, are found near the surface of the water where there is enough light to allow photosynthesis.

"Half of the world's oxygen is produced by these organisms," explained Professor David Thomas of the Faculty of Ocean Sciences at Bangor University. «If you took that, you would lose the basis of life on the globe. There simply wouldn't be enough oxygen to sustain life.

Bacteria also play a vital role in breaking down organic matter in the water and recycling dead organisms. Zooplankton, which encompasses a wide range of small organisms, from single-celled protozoa to creatures such as jellyfish, krill, and copepods, is the basic link in the oceanic food chain.

What are the least important species in the world?

And here are some species that we would like to do without:

  • Wasps: Capable of injecting venom from the end of their sting even after they have died, it is a popular question entomologists are faced with: what are wasps really good for?
  • Rats: They are transmitters of diseases like the plague and live in sewers. Without careful control there would be pests in a very short period of time.
  • Carrier pigeons: Known as sky rats, they are considered pests in most urban centers in Britain.
  • Lice: These scurrying crustaceans thrive in the hot, humid corners of homes and are a child's greatest nightmare in school.

Is the human being an animal?

We have many things in common with bacteria, plants, and insects. But above all we have things in common with mammals. We actually have EVERYTHING in common with all mammals: We eat, reproduce, bleed and die like any other animal. The fact that we can talk and wish for immortality doesn't make us special. We come from a very ancient lineage and share genes with every single living creature that has lived on this planet in the last 3.500 billion years. Extinct or not. To say that we are not animals is also to say that we do not belong to planet Earth.

Then, Is the human being an animal? Of course we are animals. First of all, we are warm-blooded mammals and we give birth to our live young, not eggs.

We also belong to a group of animals called "higher primates." The animals that are closest to our Chimpanzees, Gorillas and Bonobos. Without a doubt, the closest animal to us is the Bonobo.

The human being is a biological subset of animals.

How are animals classified?

There are many different kinds of animals and every animal in the world belongs to one of them.

They are animals that have a backbone. The five best known classes of vertebrates are mammals, birds, fish, reptiles, and amphibians. All of them are part of the chordata edge.

There are also many animals without a backbone. These are called invertebrates and are part of the arthropod phylum (arthropods). Two of the best known classes of this phylum are arachnids (spiders) and insects.

What types of animals are there?

They live on land and in water. They are cold-blooded and lay eggs. Its skin is moist and its feet are webbed.

Contrary to popular belief, arachnids are not insects, although their characteristics are similar, they have 8 legs and an exoskeleton.

The birds have feathers and hatch from hard-shelled eggs. A common misconception is that what makes an animal a bird is its wings. Bats have wings and are not birds. What characterizes them are feathers and birds are the only animals that have them. The wing and tail feathers overlap. This helps them to fly, steer, and land.

They are carnivorous mammals with a short snout, a rounded head and are digitigrade, that is, they only support their fingers when walking. The front legs have four toes, and the rear five toes. Both legs have retractable nails.

They are invertebrate and arthropod animals, which have the body divided into three parts: head, thorax and abdomen. Most species undergo metaforsphis where they partially or completely change their body to reach their adult stage.

They give birth to live animals, which they raise in their womb. They have soft fur or skin. They are warm-blooded and suckle their young with breast milk.

They do not have skin, instead they have scales, they breathe underwater thanks to their gills. Its arms are replaced by fins. They lay eggs and are cold-blooded.

They do not have fur, instead they have scales. Her skin is dry. They usually lay eggs. They are cold blooded.

What is an ecosystem?

The ecological system is called ecosystem. An ecosystem includes all living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (climate, earth, sun, soil, climate, atmosphere). Ecosystems are the foundations of the Biosphere and determine the health of the entire Earth system.

In an ecosystem, each organism has its own niche or role to play. This complex and wonderful interaction of living beings with their environment has been the basis for the flow of energy and the recycling of carbon and nitrogen.

Every time a "foreign body" (living thing (s) or external factor such as temperature rise) is introduced into an ecosystem, it can be disastrous for that ecosystem. This is because the new organism (or factor) can distort the natural balance of the interaction and potentially damage or destroy the ecosystem.

Normally, the biotic members of an ecosystem, along with their abiotic factors, depend on each other. This means that the absence of a member or abiotic factor can affect all parts of the ecosystem.

Unfortunately, ecosystems have been disrupted and even destroyed by natural disasters such as fires, floods, storms, and volcanic eruptions. Human activities have also contributed to disrupting many ecosystems and biomes.

Ecosystem goods and services

These are the vital services that ecosystems provide to human life, their well-being and future economic and social development. For example: Ecosystem benefits include food, water, wood, air purification, soil formation, and pollination.

How many ecosystems are there in the world?

Aquatic animals are those that live totally or partially in water for most of their lives.

They are divided in three ways, depending on the habitat:

They are the animals that live mostly on land for most of their lives.

They are divided according to habitat:

These animals have the ability to fly on their own, using wings that may or may not have feathers. They are usually insects or birds.

How do the animals eat?

Animals are governed under the food chain that dictate their behavior, diets etc. Most animals bring food into their body through an opening, the mouth, to be digested and absorbed inside. Depending on the food they eat, they are divided into three groups: herbivores, carnivores and omnivores. Some animals, including some worms, insects, lampreys, and the vampire bat, feed on blood.

Other animals, such as dung beetles and crabs, are called detrivores that eat dead or decaying food and waste.

Herbivores eat mostly plants, or plant parts such as leaves, fruits, seeds, nectar, shoots, and roots.

Carnivores eat the meat of other creatures (sometimes their entire bodies). If they feed exclusively on insects, they are called insectivores, if they feed on fish, they are called piscivores.

Omnivores consume a wide range of both plant and animal foods.

How do animals reproduce?

Some animals produce offspring through asexual reproduction while other animals produce offspring through sexual reproduction. Both methods have advantages and disadvantages.

Asexual reproduction

The basic modalities of asexual reproduction are: budding, fragmentation, bipartition, sporulation or sporogenesis, polyembryony and parthenogenesis.

These animals do not have sexual organs to reproduce and hinder by other methods such as cloning.

Sexual reproduction

The basic modalities of sexual reproduction are: viviparity, oviparity and ovoviviparity.

They develop within the female and are born in a non-embryonic state.

The fertilized eggs are deposited outside the female's body and develop there, receiving food from the yolk that is part of the egg.

The fertilized eggs are retained within the female; the embryo is nourished by the egg yolk and the young are fully developed when they hatch.

How do animals behave?

The behavior of animals, the concept, widely considered, refers to everything that animals do, including movement and other activities and underlying mental processes. The human fascination with animal behavior probably dates back millions of years, perhaps even to times before the ancestors of the species became human in the modern sense.

Initially, the animals were probably observed for practical reasons because early human survival depended on knowledge of animal behavior. Whether hunting wild animals, keeping pets, or escaping an attacking predator, success required an intimate knowledge of an animal's habits. Even today, information about the behavior of animals is of considerable importance.

For example, in Great Britain, studies on the social organization and varied patterns of badgers (Meles meles) have helped reduce the spread of tuberculosis among cattle, and studies on the sociality of foxes (Vulpes vulpes ) help develop models that predict how quickly rabies would spread if it crossed the English Channel. Similarly, in Sweden, where collisions with moose are one of the most common road accidents in rural areas, research on the behavior of moose has allowed them to be kept off roads and shoulders. In addition, research on the foraging of pollinating insects, such as honey bees, has led to impressive increases in agricultural crop yields around the world.

Currently, animal behavior is divided into three large groups: domestic animals (including farm animals and pets), wild or wild animals and animals dangerous to humans.

Domestic animals are those that are capable of living among humans, adapting to their way of life. They can be farm animals or pets.

They are those who live totally in freedom, in any ecosystem, be it terrestrial, aerial or aquatic.

Many dangerous animals live on planet earth that can kill in different ways: with claws, with large teeth, with great force or with lethal poisons.

How does humans affect nature?

Modern humans have been around for a long time and have lived for a long time without causing much irreparable damage to the environment. However, overexploitation and pollution have started to negatively affect the environment in recent centuries.

Increasing population places excessive demands on natural resources and increases the demand for agriculture and livestock. There are many negative impacts associated with the population explosion.

Unfortunately, humans are the most polluting species. The Earth is very good at recycling waste, but people are generating much more than the Earth can handle. Pollution occurs at different levels and not only affects our planet; it affects all species, including humanity, that inhabit it.

How does humans positively affect the environment?

Only humans can think and act to make positive changes in the environment.

  • Captive breeding and release of endangered animals: Nearly extinct animals are raised in protected environments. When the number is sufficient, they are reintroduced into the wild. An example is the Arabian oryx. These animals were bred in captivity at the Phoenix, San Diego and Los Angeles zoos and later released in the Middle East. California condors, Mauritian kestrels, and black-footed ferrets are some of the other species that have been bred and released in captivity.
  • Selective removal of invasive species: Some plants and animals deliberately or accidentally introduced to new areas often thrive there. They end up replacing native plants and the ecosystems that have been supported by them for thousands of years.
  • Protection of native species: Chinese giant pandas are known for their low reproductive rate in the wild. The Indian tiger is threatened by illegal poaching. Manatee that live in shallow waters are also threatened. All these animals and others are protected by declaring certain areas of their native habitat as protected reserves. This can help increase their numbers.
  • Control forest fires: Every year, wildfires that start spontaneously in dry areas destroy large areas of forest and the animals that live in them. Human efforts often help contain the damage to some degree.
  • Waterway cleaning: Waterways become clogged with accumulation of natural debris and overgrowth of plants, and also by the dumping of waste. Regular cleaning prevents flooding of banks and protects many ecosystems.
  • Reforestation efforts: Large areas deforested for cultivation, grazing and human settlements are reforested with native plant species to restore ecological balance.
  • Search for renewable energy sources: Biofuels made from ethanol and plant-based oils are used to reduce dependence on rapidly depleting oil reserves. Wind turbines and solar power generators can help meet local electricity needs and take some of the load off the electrical grid.

How does humans negatively affect the environment?

  • soil contaminationMade with pesticides, herbicides, large landfills, waste from food processing industries, and nuclear waste generated by nuclear reactors and weapons deplete our soil of its nutrients and render it virtually lifeless.
  • water contamination: Industrial effluents, fertilizer runoff, and oil spills damage fragile ecosystems.
  • air pollution: Burning fossil fuels and toxic gases produced in factories causes pollution. Air pollution infects the environment and threatens the health of everyone on earth.