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Why is Costa Rica so biodiverse?

Why is Costa Rica so biodiverse?

Connecting north and south, Costa Rica acts as the most important natural link on Earth.

As a child, I remember visiting the many national parks in our country.

One that stands out most in my recollections is Tapantí. This park excited me because as soon as we arrived there, we could feel the air changing: it felt purer. So too did the water. Although freezing, we loved swimming in the park’s rivers and pools, and splashing under the waterfalls.

Today, I still get excited when we go to visit the park, since it is one of the places with the most microclimates in the country, thanks to the immense variety in terrain.

This abundance in biodiversity is one of the reasons why we Ticos are so proud of our country and care so much about our natural environment. The green of nature is something that we carry in our blood.

Costa Rica: A biodiverse bridge connecting two continents

The history and development of our rich lands also impacted the biodiversity of the US and, in turn, the world.

For millions of years, North and South America were separated by water. There was a gap between the continents through which the waters of the Atlantic and Pacific Oceans could flow freely. Naturally, this prevented species from interacting with one another. As many animals and plants had no way to cross the water, they could not migrate.

Today, many of these species, such as the North American horses and camels, can only be found in books.

However, approximately three million years ago (or 15 million, according to some scientists), volcanic activity in what is now Costa Rica created a bridge between the continent, through the consolidation of a new continental mass. This is how what we know today as the Cordillera de Talamanca was formed in our country.

This new mountainous landscape rose out of the sea and caused erosion, which allowed material to consolidate and form a bridge of safe passage for all species between the North and South.

frog in costa rica

It is from this that the lands of Costa Rica emerged, forming a natural biological bridge that would change the history of biodiversity on our planet forever.

When this bridge was formed, it not only allowed plant and animal species to pass from one continent to the other, but also facilitated a cultural exchange through human migrations that continues to this day.

All this change allowed for numerous species to spread to new territories. For instance, nowadays, oak and walnut trees are prevalent in most of the Americas, but these species were originally only found in the North. Likewise, the opossum, armadillo, and porcupine, which are present in North America today, all trace back to ancestors that came across the land bridge from South America.

Of course, these changes did not only affect the terrestrial world; a new natural marine barrier was also formed. This closed a passage for many species of marine animals and brought about a distinct change in the marine fauna and flora along the coast.

Since the Pacific and Atlantic oceans were separated, various species had to change their route and adapt to the new conditions. Especially as the mangrove forests, coastal ecosystems rich in biodiversity and a natural habitat for many species, are now only found on the Pacific coast.

“The green of nature is in our blood”

All these changes contributed to Costa Rica’s immense biodiversity. Today, we are one of the most biodiverse countries in the world. Even though we only have 0.03% of the world's land mass, we are home to approximately 6% of the planet's biodiversity.

Without a doubt, the change in our landscape changed the course of global biodiversity. And it's something our country has fought for all these years, as we continually strive to be a green country; one that takes pride in and strives to preserve its natural heritage as much as possible.

We know that pollution and many other factors threaten our planet’s health today. It is for this reason that at least 25% of our national territory and the more than 40 biological corridors that run through it, from the cloud forests of Monteverde to the coastal mangroves of San Antonio, are protected.

“The concept of corridors is simple,” says one travel expert. “In the reserves and parks, they are areas of connectivity; places where species can move freely within a network of habitats. The goal of corridors is to provide a safe haven that promotes survival in an increasingly fragmented world.”

Our country is surrounded by two oceans, many mountains, and one of the most important volcanic ridges on the planet, and has generated a huge variety of climates and approximately 12 varieties of ecosystems. All of this has allowed an astonishing variety of plant and animal species to thrive in a small country.

Today, we are proud to be a global forerunner in biodiversity preservation and nature conservation.

Ticos are progressive in protecting the immense diversity that graces Costa Rica’s landscape. Through policy and community collaboration, they offer a model for the rest of the world.

Visit us and fall in love with Costa Rica. A small country, with a big heart and the most unique and diverse range of fauna and flora that can be found around every corner.

Indira Frías

Indira was born in Panama, but found her roots in Costa Rica. She has a degree in Bilingual Communication, and specialises in areas of self-knowledge and nature. It's for that reason she enjoys living in a country as green as Costa Rica. She has written for Orgullo Latino since 2022.

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