Animal Superpowers

Could humans develop superhero-like abilities by imitating the senses of animals? From the extraordinary sense of smell of dogs and the echolocation of bats to the limb regeneration of salamanders and the remarkable diving abilities of seals, nature offers examples of abilities that seem straight out of science fiction but are actually the result of millions of years of evolution.

22 de mayo de 2024

Nature provides an astonishing array of remarkable abilities, including enhanced senses for detecting the environment, impressive regenerative powers, and extraordinary physical endurance. Although these abilities often seem as if they belong in a movie, they are fascinating biological realities that have made some species truly extraordinary.

Today, biotechnology and medicine are beginning to uncover the mechanisms behind these remarkable traits, raising an exciting question: could science allow us to mimic some animal senses and push beyond human limitations? Explore some of the most fascinating animal abilities in this article.

Animals’ Super Senses

Can you imagine being able to tell whether your friend had recently been somewhere simply by smelling the ground? Or knowing who was on the other side of a door without seeing or hearing them? Dogs can do this—why can’t we? Dogs have a slight advantage: their noses contain between 20 and 40 times more olfactory receptors than ours. But could humans one day develop a heightened sense of smell, like Wolverine from the X-Men?

Researchers at the University of Florida have discovered a way to give humans a super sense of smell more like that of dogs or wolves. By suppressing a gene called Kv1.3, researchers have increased rats’ sense of smell by a factor of 1,000 to 10,000 and significantly improved their ability to distinguish between different scents. Humans also possess this gene, so in theory, if it could be blocked through medication or, in the future, through gene therapy, we might one day enjoy an exceptionally powerful sense of smell.

Even so, the human sense of smell is more impressive than many people realize. With practice, we can greatly improve our ability to distinguish among odors. In France, people who wish to become perfume experts train for seven years. By the end of their training, they can identify around 600 basic scent compounds. This skill is developed through repeated practice of the sense of smell. With just a few days of training, for example, we can learn to recognize the scents of family members and friends.

Canines’ sense of smell is especially useful for police, as dogs help police to find drugs, bombs, etc.

Smell is one of the five senses that allows us to gather information about and interact with the world around us. The sense of smell detects volatile chemical substances suspended in the air we breathe. In a way, it can be thought of as a form of “chemical vision.” Smell is closely related to taste, but instead of coming into direct contact with solids or liquids, it detects gaseous chemicals and particles suspended in the air.

When light is scarce, sound waves bouncing off objects—and the sounds those objects make—can allow an animal to “see” in the dark. This is the ability possessed by the blind superhero Daredevil, and it is exactly what bats do to navigate at night: they rely on a kind of super-hearing to find their way in the dark. Bats emit ultrasonic calls that bounce off surrounding objects and return to their ears, allowing them to determine the location of those objects. This process is called echolocation.

Humans cannot hear bats’ calls because our hearing is limited to a certain range of frequencies. We are also not particularly good at pinpointing the exact source of a sound. This limitation is partly due to the shape of our ears. But could we overcome it?

With a bit of technology—and perhaps some surgery—it might be possible to give humans hearing abilities more like those of bats. Hearing implants already exist that connect directly to the auditory nerve, and in principle they could be modified to allow us to detect a much wider range of frequencies. Of course, our brains would then need to learn how to process all these new sounds and turn them into useful information. This would likely be easier for young children, whose brains are especially adaptable and capable of integrating new sensory experiences into their perception of the world.

Bats can “see” in the dark thanks to the ultrasounic calls they emit.

As for echolocation, we could potentially improve our ability to determine where sounds come from by modifying the shape of our outer ear, or pinna. Owls, for example, are experts at locating sounds thanks to the arrangement of the feathers around their ears. Experiments in which volunteers wore wax prosthetics to alter the shape of their ears have shown that, in just a few weeks, the brain adapts to this new form of hearing and becomes better at locating the source of sounds.

Amazing Animals That Can Predict Earthquakes

On December 24, 2004, a massive earthquake struck the Indian Ocean, triggering devastating tsunamis that swept across the coasts of Indonesia and many other countries. Hundreds of thousands of people lost their lives. No one had predicted the disaster—or had they? Elephants near affected coastal areas moved inland long before the destructive waves arrived.

How did they do it? Scientists believe that elephants can detect very low-frequency sounds, known as infrasound. These extremely deep sounds may allow them to communicate across distances of up to 5 kilometers on the open savanna. Infrasonic waves are also generated before earthquakes, as the Earth’s crust shifts violently and produces vibrations that travel quickly through the environment. As a result, elephants may detect signs of danger long before humans do.

However, this hypothesis still needs to be confirmed through rigorous scientific studies.

It is believed that elephants can predict earthquakes thanks to their capacity to hear infrasonic sounds.

Animals’ Super Vision

No matter how good your eyesight is, you will never see quite like an eagle. Eagles can spot prey from remarkable distances. And many animals can see things in the darkness that humans cannot because they are able to detect dimmer light or even wavelengths beyond our vision, such as infrared or ultraviolet light. Could humans acquire these abilities? In theory, doing so would require some form of biological modification or surgery, but scientists believe it may one day be possible

Dr. Ron Douglas, a scientist at City University of London, has suggested that giving humans the ability to see additional wavelengths of light might be relatively straightforward. Goldfish and butterflies, for example, can see ultraviolet light. The photoreceptors in our retinas—called rods and cones—contain light-sensitive proteins known as opsins. Small differences in the structure of these opsins determine which wavelengths of light they absorb. In principle, introducing the gene for a butterfly opsin into human eyes might allow us to detect ultraviolet light. Although the idea sounds simple, many biological challenges would still need to be overcome.

On the other hand, the ability of eagles to see their prey in great detail at a long distance is possible thanks to the fact that they have many cone photoreceptors tightly packed into their retinas. Therefore, one manner of increasing our eyes’ resolution would be to increase the number of cones. This, however, would mean being submitted to an unpleasant process of making our eyes bigger.

Limb Regeneration: An Extraordinary Ability

Imagine a salamander losing a leg after a predator bites it off. Within 24 hours, a layer of stem cells covers the wound, and the limb begins to regenerate: first the toes, then the nerves, muscles, and even the bones. Three months later, the leg has fully regrown and functions perfectly. People who suffer similar injuries are not so fortunate. How do salamanders do it? Could humans one day acquire this ability, like Claire from the TV series Heroes?

In some way, adult salamander cells can return to a stem-cell-like state—a type of cell usually found only in embryos. In this state, the cells can multiply, transform into different cell types, and organize themselves to rebuild an entire organ complete with all its tissues. Stem cells are remarkably powerful.

Surprisingly, humans are not all that different from salamanders. After an amputation, our cells initially respond in a similar way. Later, however, humans undergo a scarring process, while salamanders activate regeneration. Studies suggest that human cells might be able to respond more like salamander cells if properly stimulated. Today, scientists can regenerate skin and repair damaged nerves using substances that reprogram adult cells, enabling them to rebuild certain tissues. To continue advancing in this field, researchers study amphibians to better understand the biological mechanisms that make regeneration possible. Some experts believe that within 10 to 20 years, it may become possible to regenerate amputated human limbs.

Salamanders are the only vertebrate capable of regenerating an amputated limb as many times as necessary.

Although humans are still far from matching salamanders, there is one example that hints at our hidden regenerative abilities. If an amputated fingertip is allowed to heal naturally—simply cleaned and covered with a bandage—it can sometimes regenerate many of its structures, including bone, skin, nail, nerves, and soft tissue. There is substantial medical evidence documenting this phenomenon in both children and adults. Such findings give scientists hope that one day humans may be able to regenerate entire limbs.

Amazing Animals and Their Remarkable Abilities

Nature is home to even more astonishing abilities. Some mammals, for example, can remain underwater for long periods without surfacing to breathe, while certain birds can adjust their sleep patterns to cope with extreme situations and environments.

The Weddell Seal and Its Diving Ability

On June 7, 2008, German freediver Tom Sietas set a world record for static apnea by holding his breath underwater for 10 minutes and 12 seconds. This may sound incredible to us, but for a Weddell seal, it is routine. These animals can dive for up to 30 minutes and reach depths of as much as 600 meters. Could humans one day do the same? Perhaps.

When Weddell seals dive deep underwater, blood flow is redirected primarily to the central nervous system—the brain and spinal cord—which cannot survive without a continuous supply of oxygen. The most remarkable aspect of these animals is that their muscles continue functioning despite receiving very little blood and do not suffer damage. This is possible because their muscles contain high levels of myoglobin, a molecule that stores oxygen more effectively than hemoglobin. Thanks to myoglobin, muscles can access oxygen even when blood oxygen levels are low.

Researchers have discovered that Weddell seals are not born with exceptionally high levels of myoglobin and are now trying to determine how adult seals develop this ability. In the future, these findings could help scientists increase myoglobin levels in human muscles and potentially improve our diving capabilities.

A Weddell Seal

When submerged in water, the human body also responds to the temporary lack of oxygen and increased pressure. This response is known as the mammalian dive reflex. It allows us to hold our breath much longer than under normal conditions and helps prevent serious damage. Some of the adaptations involved include:

• Bradycardia: a slowing of the heart rate.
• Peripheral vasoconstriction: blood vessels in the limbs constrict, redirecting blood toward the heart, lungs, and brain.
• Splenic contraction: the spleen releases oxygen-carrying red blood cells into the bloodstream..
• Blood shift: blood moves into the chest cavity to counteract the effects of high external pressure on the lungs, an adaptation that becomes essential at depths greater than about 30 meters.

Migration and Adaptation to Sleep Loss

Whether you are a student or have a job, you have probably realized at some point that there never seem to be enough hours in the day. What if we could remain active for all 24 hours instead of “spending” eight hours sleeping every night? Some migratory birds need very little sleep for months at a time, and newborn dolphins—as well as their mothers—may go without sleep for the first month after birth. Could humans one day control how much sleep they need without affecting their physical or mental health?

The ability of these animals to remain awake for long periods without apparent harm suggests that humans may also possess some of the underlying physiological potential to do so. “If we could develop a medication that stimulated the same regions of the brain that allow migratory birds to tolerate sleep loss, we could live 20-hour waking days instead of the 16-hour days we typically have,” explains Dr. Verner Bingman, who studies Swainson’s thrushes—birds that migrate roughly 5,000 kilometers from Canadian forests to Peru. These birds normally sleep between 10 and 12 hours per day, but during migration they reduce their sleep to only about 2.5 hours daily.

To cope with this lack of sleep, these birds have developed two important adaptations. First, they are capable of unihemispheric sleep, in which the two hemispheres of the brain alternate periods of rest. Birds can continue flying with one eye open while the brain hemisphere controlling the other eye remains asleep. Second, they can take micronaps lasting only 10 to 20 seconds while flying. When combined, these brief periods of sleep allow them to function for long periods without entering deep sleep. Some researchers are now investigating how long micronaps would need to last to be effective in humans.

Swainson’s thrushes can alternately “turn off” their brains’ hemispheres or take 10- to 20-second micro-naps while on long migratory flights.

Dolphins do not sleep even for a second during their first month of life.

The Hypothetical Superhuman: Traits and Fascinating Features

If it were possible to create a human with the superpowers found in many animals, these are some of the extraordinary abilities such a superhuman might possess.

Wolf’s Sense of Smell: By suppressing the Kv1.3 gene through genetic engineering, medication, or RNA interference, our superhuman could develop a sense of smell up to 10,000 times more sensitive than that of an average person.

Seal’s Diving Ability: By increasing the amount of myoglobin in the muscles, this superhuman could store larger amounts of oxygen and remain underwater without breathing for up to 30 minutes.

Dolphin’s Sleep: Medications could activate brain regions that allow the superhuman to stay awake for extended periods or rely on micronaps. Like dolphins, they might even sleep with one eye open, alternating which hemisphere of the brain is resting.

Bat’s Keen Hearing: An electronic hearing implant could allow this person to hear ultrasonic sounds. Surgical modifications to the outer ear could improve the ability to determine the exact origin of sounds after a period of training.

Owl’s Night Vision: Genetic engineering has managed to introduce additional opsin genes into the eyes, enabling the detection of ultraviolet light.

Eagle Vision: The eyes could be enlarged to accommodate more cone photoreceptors in the retina. This would dramatically improve visual resolution, allowing the superhuman to see much finer details from great distances.

Salamander’s Regeneration: If an amputation occurred, cells around the wound could revert to a stem-cell-like state and regenerate the missing limb within a matter of months.

WRITTEN BY Héctor Ruiz Martín

Pictures & Illustrations credits

• Superhero – Maxim Maksutov @123rf.com
• Weddell Seal – J. Plötz
• Hypothetical Superhuman – Antonio Cuesta
• Dog, Bat, Elephant, Eagle, Salamander, Dolphin, Swainson’s thrushes – istockphoto.com and Wikimedia Commons