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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...
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...
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...
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...
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...
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...
Twins sisters with Appaloosa horse and Dalmatian dogs in rainy autumn park. By Julia Shepeleva | Shutterstock.com

Do other animals give birth to twins? Examples from the animal kingdom

Assuming you’re human, the likelihood of having twins is quite little. But, depending where you’re from, there’s a surprising amount of variation. In Central Africa, the twinning rate is almost 30 in every 1,000 births; in much of Asia and Latin America, the average is as low as eight...
Aldabra giant tortoise. By Daniel Wilson | Shutterstock.com

Longevity: a look at the shortest and longest lives in the animal kingdom

Life, but not as we know it. For all the scientific advances that humankind has made, we’re still grappling with some of the fundamental questions about life. Not just the distant, existential questions, such as the origins or meaning of life, but more immediate questions about life on Earth. Are...
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...
The Big Five: the wildlife stars of African bush

The Big Five: the wildlife stars of African bush

‘The Big Five’ is synonymous with African safaris. While the term is now widely used within the realms of wildlife tourism, the term (originally ‘big five game’) was actually coined by hunters.  The African elephant, African lion, African leopard, Black rhinoceros and Cape buffalo are not the biggest animals in...
Zebras. By Fabrizio Frigeni

What is homeostasis?

Environmental factors are the characteristics of the external environment that have a direct impact on our organism. Sometimes, the alteration of some of these parameters (such as temperature or humidity) can negatively affect bodies, damaging and disrupting the execution of physiological functions. It's important for animals to be able...
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...
Common vampire bat, Desmodus rotundus. By Natalia Kuzmina | Shutterstock.com

Do vampires exist? From vampire myths to the truth about bloodsucking bats

When we hear the word vampire, we automatically think of a human-like creaturewith long fangs that feeds on people’s blood. Vampire myths have been around for ages and they continue to be a part of our culture today. According to popular folklore, a vampire is a creature that feeds on...
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...