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The FWP weekly digest of wondrous wildlife happenings
and other interesting items from the natural world

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Lisa S. French

Compared to many of the creatures featured on Weekly Wondrous, the electric eel (Electrophorus electricus) scores relatively low on the cuddlesome quotient, however, what the high-voltage South American river dweller lacks in animal magnetism, it makes up for in shock value. And the most shocking eel of them all, the new species Electrophorus voltai, was discovered this fall by scientists at Smithsonian’s National Museum of Natural History.

But before we get to that electrifying story, perhaps you are wondering, “What are eels, anyway? Reptiles? Amphibians? Fish? Amphishians?” Strictly speaking, electric eels are not true eels but a species of electric fish—long, blade-shaped knifefish to be exact, and more closely related to carp and catfish than eels. The 800-plus species of true eels primarily live in saltwater, while electric eels can only be found in the murky freshwater habitats of the Amazon and Orinoco Rivers. It was there, in the highland waters of the Brazilian Shield, that the approximately 8-foot long, 860-volt-producing Electrophorus voltai was identified—the strongest living bioelectricity generator known to date. To put that impressive eel power into perspective, the human body is only capable of producing and transmitting between 10 and 100 millionths of one volt over a distance of approximately one-millionth of a meter, a fact for which those of us who travel by crowded subway are quite grateful.

Like all species of electric eels, the E. voltai produces its record-breaking current through the stimulation of thousands of synchronized stacked cells called electrocytes in three pairs of electric organs that take up 80% of the length of its body. The Smithsonian researchers theorize that the 30% increase in electricity-generating potential from the highest previously recorded E. electricus measurement of 650 volts may be an adaptation to the reduced conductivity of the waters where the E. voltai species began its evolution about 7.1 million years ago.

Electric eels make full use of their innate ability to self-generate jolts, utilizing their piscine electro-pulses for eel-to-eel communication, navigation, self-defense, and to locate and stun small fish and invertebrate prey. The objects of the carnivorous fish’s shocking attentions are captured through a highly effective two-step strategy, which researchers at Vanderbilt University have compared to a type of remote control. First, the eel transmits an electric pulse, which causes whole-body contractions in its prey, revealing its location, then a second shock is administered to immobilize the target for ease of swallowing.

In case you are curious as to how eels manage to avoid electrocuting themselves when they get down to their meal-zapping business, one hypothesis is that the amount of the electricity flow is small in proportion to the eel’s body but significant to the size of its prey, and of very short duration (about two milliseconds). In addition, a large percentage of the current dissipates into the water, further reducing its impact on the eel’s critical organs.

Studying and understanding how eels generate and transmit electricity has inspired all manner of technological and medical innovations that benefit humankind, ranging from the first electric battery in 1799 to the ongoing development of soft robots, cardiac pacemakers, and artificial organs. While an effort has been made to determine what it would take to run a Tesla Model 3 on eel power for one hour, the estimated requirement of 7,200 eels in 144,000 gallons of water indicates that particular research endeavor to be a non-starter for both the Tesla and the eels.

Two hundred and fifty years after the discovery of the first electric eel species in South America, the recent identification of the E. voltai in the same region is yet another compelling testament to the extreme importance of protecting and maintaining biodiversity hotspots like the Amazon. Given that approximately 85% of our planet’s flora and fauna remain to be discovered, it’s clear that preserving wild spaces is critical to the continued study of the living world. As biologist and naturalist E.O. Wilson writes in The Diversity of Species, “We should preserve every scrap of biodiversity as priceless while we learn to use it and come to understand what it means to humanity.”

Full disclosure: While eels are clearly some of the most remarkable creatures on Earth and can be strikingly beautiful, we empathize if you are somewhat eel-averse as we confess to hyperventilating a bit while researching this one. However, since getting fish-zapped outside of the Amazon is a low probability event, we can rest easy and simply file these slippery fellows under “admire from afar.”

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Lisa S. French October 31, 2019

Tree-Planting Tapirs

If the Brazilian tapir’s eye-catching ensemble of creature features brings to mind ancient beasts, that’s because the shy, primarily nocturnal South American megafauna is one of the oldest species of large mammal remaining on Earth. The origins of this floppy-nosed, bristly-maned, odd-toed ungulate date back approximately 35 million years. For the ungulate-uninitiated, tapirs are Perissodactyls, hooved herbivores who like their closest relatives horses and rhinoceros, possess an odd number of toes. The Brazilian, or lowland, tapir is one of four widely recognized species of tapir native to the forests, grasslands, and mountains of Central and South America and Southeast Asia.

Measuring five to eight feet long and weighing between 300 and 700 pounds, the Brazilian tapir maintains its impressive bulk by consuming up to an equally impressive 85 pounds worth of shoots, leaves, branches, and fruit a day. As it turns out, the tapir’s hearty appetite for seed-bearing plants plays an important role in restoring degraded rainforests. According to researchers at Ohio State University, 80 percent of trees in the Amazon are dependent upon animals for seed dispersal. One of the primary “gardeners of the rainforest” tapirs ingest and expel a large variety of seeds that have future tree potential. Results of a recent study carried out by scientists at the Amazon Environmental Research Institute in Mato Grosso, Brazil, found that 99 percent of 130,000 seeds passed through a tapir’s digestive systems intact. Seeds that survive the digestive process are more likely to germinate. And here’s where it gets more ‘oh, wow’ interesting: the Mato Grosso study suggests that tapirs may prefer to browse and graze in degraded plots of land rather than in unspoiled forest. When sunlight hits the earth as a result of tree canopy loss in burnt or degraded areas, it forces up and reveals tender green shoots from the forest floor that are attractive to tapirs. The tapirs observed in the study spent about twice as much time feeding in degraded plots resulting in more seed “deposits” in areas in need of reforestation.

In the Amazon, wildlife depend upon healthy forest systems, and as the Ohio State and Mato Grosso research indicates, healthy forest systems depend upon wildlife. The Brazilian tapir’s natural capacity to contribute to tree planting can be an important factor in helping to regenerate carbon-storing, rainforest habitat. That is why protecting an umbrella species like the tapir also serves to protect other animals in its ecosystem.

Despite their aptitude for seed dispersal, Brazilian tapirs alone can’t compensate for elevated rates of Amazon deforestation. In addition, as a result of rapid habitat loss due to wildfires and ongoing land-use change, as well as illegal hunting, populations of Brazilian tapirs are decreasing and currently listed as vulnerable by the IUCN. The good news is you can help keep the hooved horticulturalists of Central and South America in their gardening groove by supporting the tapir research of Nai Conservation and the conservation action plans of the Tapir Specialist Group.

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Lisa S. French October 2, 2019

Restoring Rhinos

The precious population of southern white rhinos just added a history-making new clan member. On July 28, reproductive science researchers at the San Diego Zoo Global announced the arrival of Edward, the first southern white rhino calf born in North America through the process of artificial insemination. The birth of a healthy male rhino through IVF represents an important breakthrough in a Recovery Ecology project aimed at restoring rhino populations worldwide, including the functionally-extinct northern white rhino of which only two females, Najin and Fatu, are remaining following the death of the last male, Sudan, at Ol Pejeta Conservancy, in March 2018. With the help of six southern white rhino surrogates, including Edward’s mother Victoria, scientists at the Nikita Kahn Rhino Rescue Center eventually hope to create a sustainable crash, or herd, of northern white rhinos as part of a collaborative effort to save this iconic animal.

Of the five species of rhinoceros living today, which include black, white, Sumatran, Indian, and Javan, southern white rhinos are the least endangered. From a historic low of 100 individuals in the early 1900s, through dedicated conservation efforts over the last century the population has grown to an estimated 21,000 animals in the wild, and close to 700 in zoos globally. The majority of southern white rhinos live in South Africa, but they can also be found in Namibia, Zimbabwe, Uganda, Kenya—and now a wobbly, little one in California. You can learn more about the ongoing initiatives focused on restoring rhinos to their rightful place in the wild from Save the Rhino International.

Update:

Ol Pejeta has announced more exciting progress on the road to rhino restoration! On August 22nd, veterinarians at the Conservancy successfully harvested a total of ten eggs from Najin and Fatu to create embryos for implantation into southern white rhino surrogates. On August 25th, seven out of ten donated eggs were successfully inseminated with frozen “donations” from Suni and Saut, two northern white rhino bulls. If this groundbreaking IVF procedure results in the development of viable embryos, we’ll be one step closer to reconstituting a sustainable population of northern white rhinos.

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Lisa S. French August 3, 2019

Good News for Gorillas

Home to over 3,000 different species of plants and animals, the Virunga Mountain range bordering Rwanda, Uganda and the Democratic Republic of Congo is one of the most biologically diverse places on earth. The best known and most beloved occupants of this UNESCO World Heritage site are the majestic mountain gorillas. Discovered by German explorer Captain Robert von Beringe in 1902, over the course of the 20th century, mountain gorillas suffered the impacts of habitat loss, hunting, war, and disease leading scientists to estimate that continued environmental pressures would render the critically endangered species extinct by the year 2000. Although populations of mountain gorillas in the Virunga range continued to dwindle to near extinction, 480 individuals had survived as of 2010.

An inspiring testament to the progress that can be achieved through a creative combination of government, NGO, and community-based conservation efforts, including eco-tourism, these gentle herbivores, vital to the health of forest ecosystems, are slowly making a comeback. Population surveys in 2016 found that the Virunga gorillas had increased to 604 individuals. The total population of mountain gorillas now stands at 1,004 which includes a second group in Bwindi Impenetrable National Park in Uganda. At a time when animal species around the globe are facing extreme challenges to their survival, this bit of good news for mountain gorillas underscores the vital importance of supporting wildlife conservation initiatives for the benefit of all inhabitants who share the planet.

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Lisa S. French May 7, 2019

Evolving Elephants

Unlike their Asian elephant cousins, both male and female African elephants grow tusks over the course of their lifetimes which they use for defense, debarking and moving trees, and digging for roots, salt, and water. These long incisors used as tools for daily living have made elephants targets of ivory poachers across the continent of Africa for centuries and to devastating effect. While it is extremely rare for male African elephants to be born without tusks, the 3 to 4 percent of wild female African elephants that never grow tusks have a distinct evolutionary advantage as they are more likely to survive periods of intense poaching. Scientists believe that through the process of natural selection, tuskless female elephants are passing this trait on to their daughters. As intensely hunted big tusked male elephants, known as tuskers, are eliminated from the population through poaching, the offspring of smaller tusked males and tuskless females spread the tuskless trait.

Researchers are now studying tuskless populations in heavily poached areas across Africa to determine what this growing phenomenon means for the future of the species. According to Dr. Joyce Poole of Elephant Voices, 51 percent of 200 adult females 25 years or older in Gorongosa National Park in Mozambique that survived the rampant poaching that took place during the 15-year civil war are tuskless. Since the civil war ended in 1997, 32 percent of female elephants born in Gorongosa are tuskless. In the early 2000s in Addo Elephant National Park in South Africa, 98% of 174 females were also observed to be tuskless. While current populations of tuskless elephants appear to be healthy and thriving, scientists are continuing to study the impact of tusklessness on both individual and group behaviors as well as on other plant and animal species in their native ecosystems. Through critical ongoing research, we’ll learn more about how these iconic, highly intelligent, and empathic animals are continuing to evolve and adapt to the growing human-induced pressures that impact their survival.

For breathtaking photos of some of Africa’s last great tuskers, check out Land of Giants by Will Burrard-Lucas.

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Lisa S. French March 19, 2019

Swinging Sifakas

You’d have to travel all the way to the island of Madagascar off of the eastern coast of Africa to find the wooly, wide-eyed, white-helmeted Coquerel’s sifaka in its native habitat. One of nine species of lemurs, these diurnal (active in day and night) highly intelligent primates, known as prosimians, evolved millions of years before monkeys and apes, their simian relatives. Primarily treetop dwelling herbivores, the long-legged sifaka is impressively agile, propelling itself distances of over 30 feet as it leaps and swings through the canopy of its dry forest home. For graceful ground travel, sifakas employ a two-legged sideways hopping movement, using their elegantly outstretched arms for balance. Sifakas other amazing creature features include a horizontally projecting set of lower front teeth used for grooming known as a “tooth comb” and a handy secondary tongue which helps keeps that tooth comb spic and span. Living in matriarchal social groups of three to ten animals, sifakas maintain contact with their troop known as a “conspiracy” through various vocalizations including the distinctive shi-fakh, shi-fakh sound from which this lemur species gets its name. Due to 90% loss of their forest habitat and increased hunting of culturally sacred lemurs for food, Coquerel’s sifakas have declined by more than 50% over the past 30 years. As of 2018, all nine sifaka species are listed by the IUCN as critically endangered. To learn how you can support conservation of the Coquerel’s sifaka and other lovable lemurs both in the U.S. and Madagascar, swing on over to the Duke University Lemur Center.

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Lisa S. French March 10, 2019

The name "pangolin" comes from a Malay word that means "one who rolls up".

World Pangolin Day

To celebrate World Pangolin Day, we pulled together a few interesting facts about these remarkable Asian and African mammals to raise awareness and impress your pangolin-party pals. Pangolins are shy, solitary, nocturnal animals that range in size from about three to 73 pounds and make their homes in forests, grasslands, and savannahs. Although the eight species of pangolins are also known as “scaly anteaters”, and do indeed eat ants as well as termites and other insects, they are genetically more closely related to cats, dogs, and bears. However, unlike carnivores, pangolins do not have teeth so can’t chew their food. Their stomachs are lined with keratinous spines which, combined with stones they swallow, help to pulverize the insects they’ve captured with their long sticky tongues. A pangolin tongue can be up to an impressive 15 inches long, which comes in handy when probing inside of an anthill or termite mound in search of dinner. Pangolins can eat up to 20,000 ants and termites a day (that’s 70 million a year), helping to protect forests from destruction.

Most of a pangolin’s body is covered by overlapping scales also made from keratin, the same protein that forms human hair, nails, and rhino horn. These sharp-edged scales, which make up about 20 percent of a pangolin’s body weight, protect it from predators. When under attack a pangolin curls into a tight ball and extends its scales to shield its vulnerable undersides.

Because their meat is considered a delicacy, and their scales are believed to have magical and medical properties, pangolins have become the most trafficked animal in the world. Sadly, as a result, all eight species are currently listed by the International Union for the Conservation of Nature (IUCN) as threatened with extinction. Check out this rare footage of a giant pangolin doing a bit of tree-hugging and find out what the African Wildlife Foundation is doing to help ensure the world’s only scaly mammal is not lost forever.

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Lisa S. French February 16, 2019

Leave it to Beavers

When it comes to naturally efficient ecosystem engineering, leave it to beavers. The largest rodents in North America, growing up to four feet long and weighing up to sixty pounds, these primarily nocturnal, web-footed, paddle-tailed dam builders help create the critical wetland habitats that 85% of all North American wildlife depend on for survival. When a beaver gets down to buck-toothed business, it can cut down as many as 200 softwood trees a year for food and dam building. It takes about five minutes for a beaver to chomp through the trunk of an 8-foot tree and about a week to build a 35-foot dam. These water barriers form ponds that protect the beaver colony from predators and provide underwater access to the family lodge, a dry, cozy den where males and females rest, nest and raise baby beavers, known as kits. Beaver-built ponds help to increase biodiversity by providing pooled water, plant life and shelter that attracts and supports creatures great and small including frogs, salmon, trout, ducks, heron, deer, and elk.

Beaver ponds also protect against a parched planet by trapping carbon, capturing rainfall and storing groundwater. Ranging in size from small woody clumps to 2,800-foot long mega-barriers, beaver dams contribute to water purification by filtering silt and pollution and capturing run-off from fertilizers. By transforming the landscape with their stick, stone and mud constructions these remarkable, semiaquatic ecosystem engineers create environmental benefits for wildlife, people and planet. Busy beavers indeed!

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Lisa S. French February 15, 2019

Night Pollinators

According to a report from the World Wildlife Fund, more than a third of crops globally are partially pollinated by animals. Lucky for us, these farmer’s helpers work around the clock. When busy bee and bird pollinators say goodbye to the day, night pollinators like the common fruit bat swoop in for the second shift. Bats pollinate over 500 species of plants including eucalyptus, mango, clove, cocoa, banana, and avocado.

In addition to helping keep humans stocked in delightful tropical fruits and all-important chocolate, these furry fliers play a critical role in maintaining the health and functioning of rainforest ecosystems. They can also contribute to natural reforestation of the tropics through “what goes in, must come out” seed dispersal. In case you were wondering, pollination by bats is called chiropterophily—chiro for hand, ptero for winged and phily as in tendency toward. Those of us with a tendency toward mangoes say keep up the good work little, wing-handed friends.

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Lisa S. French January 28, 2019

Strategic Squirrels

If you’ve ever watched a squirrel gather and bury nuts in preparation for winter and assumed the flurry of activity was completely random, scientists at the University of California at Berkeley have discovered that there is a cognitive strategy behind all of that bushy-tailed toing and froing. It appears that squirrels have the ability to organize information about their winter food inventory using a memory device called “spatial chunking” which enables them to bury and retrieve nuts in scattered locations according to size, type, and even nutritional value. To ensure they find their carefully categorized nuts as they left them, these crafty critters have also mastered fake burying—or the squirrel spoof. By pretending to dig and cover storage holes while slyly hiding treasured nuts away from spying eyes, squirrels keep their crunchy cache safe from potential poachers.

However, even the most strategic squirrels lack perfect memory and about three-quarters of buried nuts are never retrieved. The good news is those forgotten nuts grow into trees which provide food and habitat that other animals also depend upon for survival. And when you ’ve enjoyed the shade of a mighty oak, hickory or walnut tree a squirrel may have had a paw in the planting. If you’d like to show your squirrel appreciation, there’s actually a day for that, January 21. In honor of forest generating squirrels, go nuts!

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Lisa S. French January 21, 2019