The Amazon Rainforest, often called the “lungs of the Earth,” is more than just a vast expanse of green stretching across nine South American countries — it’s a living mystery. Beneath its dense canopy, through its winding rivers, and within its hidden valleys, scientists believe thousands of species remain undiscovered. From microscopic organisms that could hold cures for diseases to large mammals still unknown to science, the Amazon continues to defy our understanding of life on Earth.
The Scale of the Unknown
Stretching across more than 5.5 million square kilometres, the Amazon is reported to house around 10% of all described species on Earth. But that is only the tip of the iceberg. Referring to species, biologists have estimated that more than 80% of the Amazon is undescribed. Every year, scientists describe hundreds of new species of plants, insects, amphibians, and even mammals; often in places that were previously thought to be well-studied.
Between 2014 and 2020, more than 600 new species were described from the Amazon Basin - including a new subspecies of pink river dolphin, a glass frog that is clear as glass, and plant species with exciting medicinal properties. Thus, discoveries provide further evidence that we still know very little about biodiversity in the Amazon, and much of it continues to be a frontier despite technological advances and satellite mapping.
The Discovery Challenge
What makes the Amazon experience so secretive? The answer lies in its complexity. The multilayered, multisourced ecosystems create a plethora of microhabitats within the rainforest, each where species evolved in isolation from each other to occupy a few square kilometres of Earth's surface.
The challenge is not only accessibility. With some locations being days away via boat or helicopter, they can be challenging to reach. There are also poisonous species, diseases, and climate-twisters. Clearly, there is much of the Amazon that remains unexplored. Even if you added super-cool things like drone technology and DNA barcoding to the field, your experience would still hardly scratch the surface. It is nothing short of adventurous in the uncontrolled wilderness of an expansive rainforest.
Beasts of Legend and Possibility
Indigenous people of the Amazon have known about creatures
for centuries that no scientist has ever documented – enormous fish that gulp
down a man, birds that speak like humans, and glowing snakes that slide through
the jungle at night. While many may represent myths, there could be a base
truth that is recognised as an undiscovered species.
Take, for example, the Mapinguari, a sloth-like creature said to wander the forest while emitting a foul smell and covered in thick, armoured skin. Some cryptozoologists hypothesise these tales to be derived from the giant ground sloth (Megatherium), which is thought to have existed tens of thousands of years ago. Could there really be species today that come from this dinosaur conduit of ancestry? This is tantalising to storytellers and scientists alike.
Even the reports of enormous size anacondas, some reported
up to 40 feet long, continue in remote regions of the rainforest. While it has
yet to be confirmed with scientific investigation, size & new species of
snakes (boas, vipers, etc.) have been documented in their respective families.
The ambiguity between legend and discovery is part of what keeps the Amazon so
compelling.
Insects and Microbes: The Undetected Majority
While massive snakes and dinosaurs have captured the
public's interest, the actual diversity lies within the small and unseen.
Estimates of discovered mammals are in the hundreds, and for every single one,
there are potentially hundreds that are insect or microbes that will be
unnoticed.
Recently, researchers discovered ants that farm their own fungus
more efficiently, beetles with reflective shells that act like natural mirrors,
and spiders that are able to sense vibrations from rivers to elude prey. In the
broccoli kingdom, new fungal and bacterial microbes have been discovered that
eat plastic, and this suggests that nature might actually be finding ways to
fight back against our modern pollution challenges.
In addition, scientists have been exploring soil and plant
surfaces in the Amazon for novel microorganisms that could offer therapeutic benefits.
For example, compounds from bacteria harvested from rainforests have
demonstrated efficacy against antibiotic-resistant infections, cancers, and
viral diseases. Each undiscovered species could represent an advancement for
medicine or a caution to our potential losses.
The Danger of Losing Them Before We Know They Exist
Sadly, numerous species may be lost before we even realise
they are there. Deforestation, illegal mining, wildfires, climate change, and
other human activities are moving at an alarming rate. For example, in 2023,
the Amazon rainforest lost over 10,000 square kilometres of forest,
jeopardising the homes of countless species we have not yet named.
This loss and risk to biodiversity is called
"extinction before discovery." Each tree cut down might have once
sheltered insects that have never been identified, or plants with medicinal
value that have not yet been recognised. As the ecosystem collapses, so is the
chance to know about it. There has never been a greater need for more human understanding
and education about natural processes — not only to conserve our current
knowledge, but also for the mysterious processes that have not yet unfolded.
New Tools, Old Secrets
Modern technology gives researchers new means to probe the
hidden life of the Amazon. For example, environmental DNA (eDNA) allows
scientists to detect species by the genetic signatures they leave behind in
soil, in water, or in the air. A single sample of a river tributary from a
small spot in the Amazon can convey the presence of dozens of fish and
amphibians without the collection of a single specimen.
Tools powered by artificial intelligence also utilise sound
classifications to detect animals by their calls and to study nocturnal or
hidden species with no need for the scientists to be present. All these tools
are designed to work in conjunction with satellite imaging and drone-assisted
mapping as a new reality for discovering and comprehending a forest in ways we
had never imagined.
The Timeless Enigma
Although we have made advancements, the Amazon remains a
location where mystery occurs. Each sound that comes from the leaves, every
ripple in the river could be telling... that there might be a life form that
we've never seen before. For scientists and researchers, the rainforest
represents both the challenge and the promise of a world in which humankind
needs to remember that we still don't know very much about what holds us.
The thrill of discovery brings explorers back again and
again, sometimes at their own, or, the physical risk. They go knowing that
somewhere in the seat of that green cathedral... under a leaf, or buried in a
cave, might be a life form that will change everything we thought we knew about
evolution, biology, even medicine.
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