11 Facts About the Vaquita, The World's Most Endangered Porpoise

VaquitaCPR
VaquitaCPR

The vaquita is the rarest marine mammal in the world, and critically endangered, according to the International Union for the Conservation of Nature (IUCN). In 2016, it was estimated that there were only 30 of these porpoises left in existence. But new research suggests that the number has been cut down by more than a third—with less than 20 vaquitas left on Earth. Which is likely too small a population for the vaquita to successfully reproduce and replenish its population. Here are 11 things to know about the species before it disappears forever.

1. Scientists first identified the vaquita in 1958.

vaquita
Wikimedia Commons // Public Domain

In 1950, University of California scientist Kenneth Norris found a bleached skull on a beach north of Punta San Felipe in Baja, California. A year later, Norris's colleagues found two more. When a colleague compared the skulls to those of another porpoise at the Museum of Vertebrate Zoology at Berkeley, California, they noticed differences striking enough to consider the finds a new species. Norris first described Phocoena sinus (gulf porpoise) in the Journal of Mammalogy in 1958.

2. Vaquita means "little cow" in Spanish.

The vaquita measures about 5 feet long (the females are slightly larger than the males) and weighs no more than 100 pounds. They're the smallest of all porpoises, with chunky bodies and rounded heads. Dark rings surround their eyes and mouths, which may account for their common name (vaquita means “little cow” in Spanish). Living in relatively shallow, cloudy water, they feed on a variety of fish, squid, and crustaceans.

3. Scientists can identify individual vaquitas based on a single feature.

Some vaquitas have individually distinctive nicks and notches on their dorsal fins, which makes it possible to identify specific individuals from high-quality photographs. Beginning in 2008, scientists created a catalog of these photos, adding new individuals and recording sightings of previously identified animals. Photo ID catalogs serve as a tool to help track an individual, revealing its life history, social organization, movements, and habitat use. Researchers use them with many marine animals that have distinctive markings. Individual manta rays, for example, can be identified by the spot patterns on their undersides.

4. The vaquita is found in only one place in the world.

researchers try to spot the elusive vaquita in the Gulf of California
VaquitaCPR

Vaquitas live only in the northern Gulf of California, the body of water between Baja. California and mainland Mexico. They're homebodies, staying within the northernmost part of the Gulf, and have the smallest range of any cetacean (the taxonomic order including whales, dolphins, and porpoises). Vaquitas reproduce only once every two years, while most porpoises have a calf every year. They're most closely related to porpoises in South America, but the species diverged from these relatives at least 2.5 million years ago.

5. Up to 15 percent of vaquitas died in fishing nets every year.

For decades, fishermen after shrimp and finfish such as corvina and sierra unintentionally entangled and drowned vaquitas in their gillnets; these long, curtain-like nets float in the water, snagging the gills of fish and shrimp that swim into them. A study showed that boats from a single fishing port in the upper Gulf accounted for the fatal bycatch of 39 to 84 vaquitas each year—an annual death sentence for 7 to 15 percent of the total population.

By the 1980s, the problem had become so bad that the vaquita was listed as endangered under the U.S. Endangered Species Act in 1985 and a year later as vulnerable on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. Some good news came when UNESCO declared the upper Gulf of California a Biosphere Preserve in 1995, but it didn't do much good—just a year later, the IUCN changed the vaquita's status to critically endangered.

6. Fishing nets meant to be vaquita-proof couldn't compete with illegal fishing ...

In 2006, scientists and conservationists began developing gear that could catch fish and shrimp without harming vaquitas, including smaller nets dragged behind boats that the porpoises could avoid. Some fishermen in the Gulf agreed to test the gear. The initial results looked promising, and those efforts may well have eventually succeeded, but a bigger threat loomed: illegal fishing for totoaba, a large fish that had also been critically endangered for two decades. A single dried swim bladder of a totoaba can fetch as much as $50,000 in China, where they are given as gifts, eaten, or used in traditional medicine. People fishing illegally for totoaba continue to use gillnets, outweighing any benefit the safer, vaquita-proof nets might have had.

7. ... So the first official population estimate, in 1997, was bad news.

Scientists have a hard time making precise estimates of the number of rare and cryptic (hard to find) species such as the vaquita. These porpoises prove particularly challenging, as they tend to avoid motorized boats, travel alone or in pairs, and are barely noticeable when they surface to take slow breaths. They're so shy that some locals say they've never seen one.

In 1997, scientists from the U.S. and Mexico spent days aboard a 170-foot ship motoring in a grid pattern over water up to 165 feet deep, trying to spot and count vaquitas. They estimated the total population was 567, which probably already reflected a significant decline due to intense fishing activity and less water emptying into the Gulf from the Colorado River, which was siphoned upstream by farms and towns. The IUCN ran models using fisheries data, the 1997 population number, and other counts, and estimated that, in the early 20th century, the vaquita population may have been 5000.

8. In 2005, the Mexican government banned gillnets to protect vaquitas.

Directors of the World Wide Fund for Nature (WWF) in Mexico Maria Jose Villanueva (L), Jorge Richards (C) and Enrique Sanjurjo speak about the serious situation of the vaquita marina (Phocoena sinus) during a press conference in Mexico City on May 15, 201
Pedro Pardo, AFP/Getty Images

The alarming 1997 count spurred scientists to form the International Committee for the Recovery of the Vaquita (CIRVA in Spanish), operating with an environmental division of the Mexican government. Mexico established a Vaquita Refuge in 2005 and, after many years of urging by the members of CIRVA to permanently ban gillnets, recently prohibited all gillnet fishing in the porpoise's range—but just for two years. Mexico also provided compensation equivalent to millions of dollars to local people in the fishing industry left high and dry by the ban.

Conservation groups such as Greenpeace, the World Wildlife Fund, and Sea Shepherd Conservation Society patrol the Gulf for illegal fishing, but the totoaba trade continues. The black market money is just too good, says Andy Read, a marine biologist at Duke University and member of CIRVA. "From the perspective of the fishermen, what they could make legally fishing versus illegally fishing for totoaba, there is enormous incentive," Read tells Mental Floss. And, as a recent CIRVA report notes, "laws and enforcement are simply too weak to deter or prevent illegal fishing."

9. Despite these efforts, the vaquita population continued to plummet.

In 2008, CIRVA scientists conducted another ship-based visual survey, scanning the water for vaquitas with high-powered binoculars that could see as far as 3 miles. (Vaquitas tend to stay at least a half-mile away from boats.) They estimated the vaquita population at 245. In 2011, they tried another count, this time relying not on sightings of vaquitas, but a more accurate measure: passive acoustic monitoring devices in the water that detect sounds made by the animals. Vaquitas and other porpoises navigate by echolocation, producing distinctive clicks and whistles. "The devices look for a particular frequency," Read explains. "Nothing else makes sound in the same range, and vaquitas are acoustically very active."

For the next four years, they acoustically monitored Gulf waters—and were dismayed to see the vaquita population drop by 34 percent per year. Another CIRVA survey in 2015 combined visual and passive acoustic data collected simultaneously and made a dismal finding: Only 59 vaquita remained. The population had plummeted by 92 percent since 1997.

10. In 2017, scientists attempted to keep vaquitas in a sea pen.

temporary sea pen for vaquitas in gulf of california
VaquitaCPR

In 2017, CIRVA scientists desperate to find a solution recommended a controversial plan: Capture vaquitas, keep them in net pens in the Gulf, and hope they would reproduce.

They had no idea whether it would work. No vaquita had ever been kept in captivity, no one knew how the animals would respond, and the effort would only pay off in the unlikely event that gillnet fishing in the Gulf completely stopped. Still, they formed an international team called VaquitaCPR to give it a try. The group subsequently built a high-tech "floating sea enclosure," which they anchored in the Gulf not too far from the beach where the first vaquita skulls were discovered.

In October 2017, VaquitaCPR scientists managed to capture two of the animals. The first, a young female, showed signs of stress—including increased heart rate and respiration rate—so they immediately released her. The second, a mature female, was transported in a stretcher placed inside a box partially filled with sea water to one of the pens and initially seemed to handle the experience well. Then she began swimming frantically and crashing into the sides of the net before finally going limp. The team released her, but she panicked, swimming at the net again. Veterinarians on the team jumped into the water, realized she wasn't breathing, and attempted to resuscitate her. Three hours later, they declared the animal dead, likely due to cardiac arrest.

After that, Read and many other scientists say they were heartbroken, but still felt that the risk of extinction outweighed those of capture. Others disagreed.

"Porpoises generally, like most cetaceans, do not fare well in captivity," Will McCallum of Greenpeace tells Mental Floss. "The population was already drastically depleted, and any capture or rounding up adds extra stress to the remaining animals. The likelihood of vaquita surviving, breeding, and being released was slim."

Efforts continue to enforce the gillnet ban and remove gillnets in the reserve, but they may be too little, too late. "We should have been perfectly able to save the vaquita,” McCallum says. "We know where they are and what needed to happen to save them in the wild."

11. Scientists have sampled and preserved vaquita cells.

Some hope remains, though; cell samples taken by the VaquitaCPR team from the two captured vaquitas have been successfully cultured in the lab and frozen for use in future research. Scientists also plan to use the cells to sequence the vaquita genome.

This story has been updated for 2019.

This "Unicorn" Puppy With a Tail Growing Out of His Head Was Abandoned—Now He's Going Viral

Unicorns may not be real (sorry), but we know there's at least one puppy in the world with a tail growing out of its head. As Buzzfeed News reports, Narwhal (short for “Narwhal the Little Magical Furry Unicorn”) was born with an extra tail where a unicorn's horn would be.

Rochelle Steffen, founder of the Jackson, Missouri, animal rescue Mac's Mission, noticed the one-of-a-kind dog in a Facebook post. The puppy had been abandoned and was in need of a new home. Mac's Mission takes in a lot of animals with histories of abuse, injuries, or physical abnormalities that make them harder to adopt. When Steffen saw the unicorn dog, she knew that he was a perfect candidate for her rescue.

Puppy dog with tail growing out of its head.
Mac's Mission

Narhwal's "tusk" is about a third of the size of his regular tail, and according to his veterinarian, it causes him no pain or medical issues. He can't wag the bonus tail, but it does wave back and forth when he plays.

Mac's Mission shared a picture of Narwhal on Facebook, and it soon became clear that they would have no trouble finding him a forever home. The original post has been shared nearly 2000 times. While many people have expressed interest in adopting him, the rescue plans to care for him a little longer and make sure he's healthy and adjusted before placing him with a family.

[h/t Buzzfeed News]

9 Tiny Facts About the Chevrotain

Dave Curtis, Flickr // CC BY-NC-ND 2.0
Dave Curtis, Flickr // CC BY-NC-ND 2.0

With a round body, spindly legs, and long fangs, this odd creature gives the platypus a run for its money. Also known as the mouse deer, chevrotains are shy and mysterious, and not much is known about them. But here's what we do know.

1. Chevrotains are not mice, nor are they deer.

Lesser mouse deer or chevrotain
BirdHunter591/iStock via Getty Images

At first glance, these animals look like a weird mash-up of a deer, a mouse, and a pig. Mouse deer share a suborder with deer (Ruminantia) but are not considered “true deer.” They have their own family, Tragulidae.

2. Chevrotain species vary by weight.

Mouse deer in Thailand
MonthiraYodtiwong/iStock via Getty Images

These creatures are way smaller than any deer. Depending on the species, a chevrotain can weigh anywhere from 4 to 33 pounds. The smallest species is the lesser Malay, while the largest is the water chevrotain. No species gets any larger than a small dog.

3. There are a lot of different kinds of chevrotains.

Mouse deer
aee_werawan/iStock via Getty Images

This tiny animal comes in many variations. The family has been classified into two genera: true chevrotains (Hyemoschus) and the mouse deer (Tragulus). The spotted mouse deer are still very mysterious, so scientists have placed them in their own genus called Moschiola. Despite being categorized in different genera, they all share a similar look.

4. Chevrotain fangs are fiercer than Dracula's.

Chevrotain in a woodland
BirdHunter591/iStock via Getty Images

Open up a chevrotain’s mouth and you’ll find two long fangs. They're especially elongated in males, which use the needle-like canines to stab each other. Thanks to an extra thick coat and robust muscles around the neck and rump, these adorable fighters are protected from bites during combat.

5. Some consider the chevrotain a living fossil.

Chevrotain sticking its tongue out
Josh More, Flickr // CC BY-NC-ND 2.0

Chevrotains are the most primitive of ruminants. Like deer and similar hoofed animals, they have even-toed hooves and a multi-chambered stomach. But unlike deer, chevrotains have a three-chambered stomach instead of four, and they lack horns or antlers. They haven't changed or evolved much during their time on Earth. Scientists see them as an evolutionary link between ruminants and non-ruminants.

6. Taking a dip is the water chevrotain's best defense.

The water chevrotain is known for its ability to dive underwater when it senses a predator nearby. The miniature swimmers scrunch up and walk on the bottom of rivers and streams to prevent being picked up by the current. If there are any reeds or plants around, the animals will grab them to stay tethered. Chevrotains are able to hold their breath for about four minutes.

While hiding from hungry predators, the water chevrotain can reemerge to get some air before diving back down. Still, the animal tires easily, and can only swim for short periods of time.

7. Childbirth is an expedited experience for chevrotains.

Chevrotain in a woodland
aee_werawan/iStock via Getty Images

After getting pregnant, a female chevrotain will carry the offspring for five to nine months, depending on the species. The baby can usually stand on its own within one hour of being born. Mothers will visit their young periodically for feedings and stand on three legs while nursing.

Chevrotains are known for their ability to be almost continuously pregnant—greater and lesser Malay mouse deer can mate again only a few hours after giving birth.

8. Chevrotains are shy wallflowers.

Chevrotain in a woodland
cowboy5437/iStock via Getty Images

Due to their small size, chevrotains are preyed upon by many different animals. Lacking antlers or horns for protection, the tiny animals are forced to lead secluded lives. Some species are nocturnal and very rarely seen. Chevrotains are very shy and often graze alone, only coming together to mate. They communicate with a series of smells and noises; this timid behavior makes it difficult for scientists to study them.

9. Chevrotain hooves make a lot of noise.

Chevrotain in a woodland
asxsoonxas/iStock via Getty Images

Although normally peaceful, a male will angrily beat his hooves when agitated—they can stomp around four to seven times a second. This “drum roll” technique wards off predators and warns other chevrotains in the area that there’s danger.

Additional sources: "Water Chevrotain," Amazing Animals of the World; "Chevrotains (Tragulidae)," Grzimek's Animal Life Encyclopedia; Mammals IV, Gale Virtual Reference Library

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