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Animal Facts

All informative and interesting articles about the world of animals. Curiosities about fauna, information about the animal kingdom, its protection and many other contents about the species that compose it.

Ants and aphids in symbiosis. Photo by inkwelldodo | Shutterstock.com

Symbiosis in the animal kingdom. Mutualism, commensalism and parasitism

Sometimes, completely different species or organisms forge close or interdependent relationships, to the advantage of at least one of the parties involved. This interaction is called 'symbiosis'. It's not easy to come up with a narrow definition of symbiosis. In fact, symbiotic relationships can be divided into several groups: Clownfish swimming...
Dinosaurs. 3D illustration of a Carnotaurus. By Herschel Hoffmeyer | Shutterstock.com

How many types of dinosaurs existed on Earth? Are they all extinct?

Since the origins of life on Earth (2,700 million years ago), evolution has left the footprint of countless living organisms on the planet. Some evolved into new species, while others, due to different environmental factors, have disappeared. As is the case with the dinosaurs. When did the dinosaurs live? The Mesozoic...
Two male lions. By Nick Biemans | Shutterstock.com

Are there gay animals in nature? Homosexuality in the animal world

When it comes to homosexuality, for many people the recurring idea is that it’s something unnatural. But what does unnatural really mean? The definition of the term is something that goes against natural or human laws, especially in relation to morality. Homosexuality is something that has always been  exclusively associated...
Chimp covering his ears. By Sharon Morris | Shutterstock.com

Animal intelligence: the smartest animal species in the world

What is animal intelligence? Intelligence is one of the defining features of being human and it comes in various forms. For example, there’s verbal-linguistic intelligence (communicative ability), spatial intelligence (the ability to observe the world with the mind’s eye), logical-mathematical intelligence (the ability to solve mathematical problems) and emotional intelligence...
Knobbed Hornbill, Rhyticeros cassidix, from Sulawesi, Indonesia. By Ondrej Prosicky | Shutterstock.com

Birds, their different beaks and the functions they perform

Birds are a class of vertebrates with more than 18,000 different species. Of the various features that are common to all birds, perhaps the most characteristic is their beak. All birds have one, but it has evolved differently in each species has evolved to improve its functions in response...
Saiga antelope (Saiga tatarica) in the morning steppe. Mekletinskii Federal Nature Reserve, Kalmykia, Russia, August 2015. By Victor Tyakht Shutterstock.com

The saiga antelope. A species with a challenging existence.

The saiga (Saiga tatarica) is a medium sized (60 to 80 cm tall) antelope that inhabits the steppes of Central Asia and is classified by IUCN as "critically endangered". They live mainly in Kazakhstan and Uzbekistan, although they can be found in various areas of Russia (Kazan), China and...
A young tokay gecko is resting on driftwood. By Cathy Keifer | Shutterstock.com

How do animals see? The most impressive eyes in the animal world

The eye In order to understand how different species see the world, it is important to understand how the eye works. Images, in the form of light, are received through the pupil, using the dilation of the iris to regulate the amount of light that enters. At the back of...
White Camargue Horses galloping through water. Parc Regional de Camargue - Provence, France. By Sergey Uryadnikov | Shutterstock.com

Animal’s social behavior: Group living

The need for socialization is not exclusive to human beings. Instances of social activity can be found in many species in the animal kingdom. Some animals connect, interact and live together in a more complex way than we could imagine. When thinking of animals that display this kind of...
Humpback Whale Heatrun. By Tomas Kotouc | Shutterstock.com

Cetaceans. The small and giant mammals of the oceans

We’re all able to recognise a dolphin, an orca or one of the whale species. These animals are part of the order of cetaceans (Cetacea). But…. Did you know that there are 80 species of cetaceans, and that there are huge differences between them? What is a cetacean? The first thing to...
Fennec fox. By hagit berkovich | Shutterstock.com

Too hot? Too cold? How animals survive in extreme temperatures

In Barcelona, summer has just arrived. Temperatures are rising and behaviours begin to change. We start to drink more, wear less and switch on the air-conditioning in our homes and offices. Nevertheless, as people travel around the city, there is no shortage of red faces and sweaty bodies! These are...
Sexual selection. Great crested grebe. By Pim Leijen | Shutterstock.com

Reproductive strategies and mating systems: the foundations of sexual selection in animals

For many years, it has been been thought that living beings were basically organisms that are born, grow, reproduce and die, or that they were organisms that fulfilled their physiologic functions: nutrition, relation and reproduction. Such statements are, with some nuances, valid definitions of a “living being” and they...
Polar Bear (Ursus maritimus). By Vaclav Sebek | Shutterstock.com

Are species larger in cold environments? The principles of Bergmann’s rule

Nature isn't inert or homogeneous; thousands of processes and phenomena take place in it every second, leading to significant environmental changes. Nature is a living medium, with different habitats in which countless physical, chemical and, of course, biological interactions happen on a daily basis, creating an environment full of nuances...
Big herd of wildebeest is about Mara River. By Gudkov Andrey | Shutterstock.com

Biogeographic movements: dispersal, dissemination and migration

Over half a century ago, Biogeography appeared in the scientific landscape as a new modern science, as a response to the urge to understand and manage the impact of human activity on the planet, which was causing the alteration of the habitats of species. But what exactly is Biogeography?...
Two foxes fight in a snowy environment in Zao, in the North of Japan. Zao is the home to the only fox village in the world, which is a sanctuary for rescued foxes. They are tame enough to get close to. By CloudVisual | Unsplash

Biological interactions: male-male competition during the breeding season

Autumn is a time of change and opportunities, a season to face new challenges and experience new feelings and sensations. Autumn smells of rain, forests and wet soil. One can hear the whisper and the voice of the wind. And while the brown, ocher and yellow tones take over...
Iceland horses. By Fabian Burghardt

The domestication of animals: origins, general characteristics and stages

In the last few years, the idea that human development has been altered by the cultural changes and transformations that have occurred throughout the centuries seems to have gained ground. Indeed, these cultural processes have an obvious impact on human evolution. One of the most important cultural renovations in our...