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News articles on rodents
Mongabay.com news articles on rodents in blog format. Updated regularly.
Bison-sized rodent may have used teeth like elephant tusks
(02/23/2015) The world's largest rodent today is the capybara, weighing in at around at about 45 kilograms (100 pounds), though the record breaking female weight in at 91 kilograms (201 pounds). But that's nothing compared to the biggest rodent ever to live. Discovered in Uruguay in 2008, Josephoartigasia monesi may have weighed in at 1,000 kilograms (2,200 pounds).
Scientists reintroduce agoutis in rainforest in city of 12 million
(12/17/2014) When one thinks of Rio de Janeiro, one usually doesn't think: rainforest. However, in the heart of the city sits a massive rainforest sprung over long-gone sugar and coffee plantations. The forest—protected today as the Tijuca National Park—is home to hundreds of threatened species, but no agoutis, a common ground mammal in Latin America.
Scientists uncover six potentially new species in Peru, including bizarre aquatic mammal (photos)
(09/25/2014) A group of Peruvian and Mexican scientists say they have uncovered at least six new species near South America's most famous archaeological site: Machu Picchu. The discoveries include a new mammal, a new lizard, and four new frogs. While the scientists are working on formally describing the species, they have released photos and a few tantalizing details about the new discoveries.
Scientists discover carnivorous water rat in Indonesia, good example of convergent evolution
(06/19/2014) Researchers have discovered a new carnivorous water rat on the island of Sulawesi that's so unique it represents an entirely new genus. They believe many more new rodent species await discovery in this relatively undisturbed part of Indonesia, but mining and other types of development may threaten vital habitat before it’s even surveyed.
Loss of wildlife and deforestation can increase human disease
(05/08/2014) Deforestation is wiping out habitat for plants and animals around the world. It is linked to reductions in air and water quality, hastening climate change, and is contributing to increased rates of drought and fire. Now, for the first time, researchers have found that deforestation may also lead to a heightened risk of human disease
Chile turns to owls to combat fatal disease
(04/01/2014) This year the Hanta virus has already caused 15 deaths in Chile, according to reports in The Santiago Times. It isn't always fatal—the 15 deaths were of a total of 36 cases over six months—but the symptoms are severe. Those affected experience flu-like symptoms, as well as nausea, vomiting, diarrhoea and trouble breathing. But now Chile is using a novel method to fight the disease: owls.
Local knowledge sheds light on some of the world's strangest mammals
(03/07/2014) One of the difficulties of studying rare and endangered species is that they are, by definition, hard to find. Scientists attempting to understand their distributions and the threats to their survival can spend hundreds of hours in the field while collecting little data, simply because sightings are so few and far between.
The smoothtooth blacktip shark and four other species rediscovered in markets
(01/21/2014) Scientific American) magazine recently ran an article on the rediscovery of the smoothtooth blacktip shark (Carcharhinus leiodon) in a Kuwaiti fish market. Believed extinct for over 100 years, the smoothtooth had not been seen since the naturalist Wilhelm Hein returned from a trip to Yemen in 1902. With its reappearance, scientists scoured Kuwaiti markets and discovered an astounding 47 individual smoothtooth blacktips.
For agoutis, the night is fraught with peril
(01/15/2014) In a study recently published in the online Animal Behavior journal, scientists from the US and the Netherlands have examined the impact of predation patterns on prey's food foraging habits. The two-year long study on Barro Colorado Island, Panama, focused on the predator-prey relationship between the Central American agouti (Dasyprocta punctata), a common rainforest rodent, and the ocelot (Leopardus pardalis).
Big data shows tropical mammals on the decline
(12/12/2013) The world's largest remote camera trap initiative—monitoring 275 species in 17 protected areas—is getting some big data assistance from Hewlett-Packard (HP). To date, the monitoring program known as the Tropical Ecology Assessment and Monitoring (TEAM) Network has taken over 1.5 million photos of animals in 14 tropical countries, but conservationists have struggled with how to quickly evaluate the flood of data.
New mountain porcupine discovered in Brazil (photos)
(12/09/2013) In Brazil's Baturite Mountains, scientists have uncovered a new species of prehensile-tailed porcupine, according to a new paper in Revista Nordestina de Biologia. Dubbed, the Baturite porcupine (Coendou baturitensis), the new species was discovered when scientists noticed significant differences between it and its closest relative, the Brazilian porcupine (Coendou prehensilis). The name prehensile-tailed refers to these porcupines long, mobile tail which they use as a fifth limb to adroitly climb trees.
New prioritization for Brazil's threatened mammals pushes little known primates and rodents to the top
(09/30/2013) Scientists have applied a species prioritization scheme to Brazil's diverse mammals to deduce which species should become the focus of conservation efforts over the next few years in a new paper published in mongabay.com's open-access journal Tropical Conservation Science.
Conservationists work to give South Georgia back to the birds
(07/18/2013) A team on South Georgia has successfully completed the world's largest rodent eradication in an effort to rid the British territory of millions of rats and mice. Against the backdrop of an approaching Antarctic winter between February and May, three helicopters encountered perilous flying conditions while peppering the southern Atlantic island with 183 tonnes of the poison Brodifacoum. The team of 25 baited an area of 224 sq miles (580 sq km). The area targeted dwarfed the previous largest rodent eradication, on New Zealand's Campbell Island, by five times.
Scientists discover new giant mole rat in Africa (photos)
(04/30/2013) Although the term "giant mole rat" may not immediately inspire love, the mole rats of Africa are a fascinating bunch. They spend practically their entire lives underground building elaborate tunnel systems and feeding on plant stems. This underground lifestyle has led them to evolve small ears, tiny eyes, forward-pointing teeth for digging, and nostrils they can shut at will while digging. Some species are quite social, such as the most famous, the naked mole rat (Heterocephalus glaber), while others live largely solitary lives. If that's not enough, the family of mole rats, dubbed Blesmols, may even help us find a cure for cancer.
New species tree-dwelling porcupine discovered in critically threatened Brazilian habitat
(04/11/2013) Scientists in Brazil have described a new species of tree-dwelling porcupine in the country's most endangered ecosystems. The description is published in last week's issue of Zootaxa.
Wolves, mole rats, and nyala: the struggle to conserve Ethiopia's highlands
(11/20/2012) There is a place in the world where wolves live almost entirely off mountain rodents, lions dwell in forests, and freshwater rolls downstream to 12 million people, but the place—Ethiopia's Bale Mountains National Park—remains imperiled by a lack of legal boundaries and encroachment by a growing human population. "Much of the land in Africa above 3,000 meters has been altered or degraded to the point where it isn’t able to perform most of the ecosystem functions that it is designed to do. Bale, although under threat and already impacted to a degree by anthropogenic activities, is still able to perform its most important ecosystem functions, and as such ranks among only a handful of representative alpine ecosystems in Africa."
Photos: new mammal menagerie uncovered in remote Peruvian cloud forest
(10/03/2012) Every year scientists describe around 18,000 new species, but mammals make up less than half a percent of those. Yet mammal surprises remain: deep in the remote Peruvian Andes, scientists have made an incredible discovery: a rich cloud forest and alpine grassland ecosystem that may be home to no less than eight new mammal species. Although most of these new mammals are currently under study—and have not been officially described yet (a process which can take several years)—lead scientists, Horacio Zeballos of Peru and Gerardo Ceballos of Mexico are certain they have uncovered a small forest, surrounded by deforestation and farmland, that shelters a remarkable menagerie of mammals unknown to scientists until now.
Rodents have lowest diversity in primary forests in the Congo
(09/17/2012) For many animal families, diversity and abundance rises as one moves away from human-impacted landscapes, like agricultural areas, into untouched places, such as primary rainforests. However, a new study in mongabay.com's open access journal Tropical Conservation Science, shows that the inverse can also be true. In this case, scientists working in the Democratic Republic of Congo's (DRC) Maskao Forest found that both rodent diversity and abundance was lowest in primary forest.
Bizarre new rodent discovered in Indonesia has only 2 teeth
(08/22/2012) The Indonesian island of Sulawesi is a workshop of bizarre evolutionary experiments. Think of the babirusa, pig-like species with tusks that puncture their snouts; or the maleo, a ground-bird that lays its eggs in geothermal heated sand; or the anoa, the world's smallest wild cattle. Now the island, made up of four intersecting peninsulas, can add another bizarre creature to its menagerie of marvels: the Paucidentomys vermidax, a new species of rodent that is different from all others.
Rodent robbers fill role of mega mammals, help spread tropical trees
(08/07/2012) In order to disperse their seeds, large-fruited tropical trees probably relied on massive mammals that roamed the earth over 10,000 years ago. But with giants such as the mastodon now extinct, thieving rodents—who continually excavate and rebury others' seeds—may be filling their role, according to a new study in the Proceedings of the National Academy of Sciences (PNAS).
Camera traps discover new populations of nearly extinct chinchillas
(07/25/2012) The short-tailed chinchilla (Chinchilla chinchilla) once inhabited a range including the mountainous regions of Argentina, Bolivia, Chile and Peru, but today the species survives in only a handful of areas in northern Chile and Argentina. Worse still, evidence of the Argentinean populations are restricted to remains discovered in the droppings of their natural predators. But, since 2011, Pablo Valladares from the University of Tarapaca in conjunction with the National Forestry Corporation of Chile (CONAF) has been searching Tres Cruces National Park for previously undocumented populations, and it has finally paid off: Valladares and colleagues discovered two new colonies with remote camera traps.
New mammal discovered in Indonesia
(07/24/2012) Researchers have discovered a new species of rodent in Indonesia's Mekongga Mountains, reports the Jakarta Post. The new rodent, Christine's Margareta rat (Margaretamys christinae), is only the fourth in the genus Margaretamy, all of which are found on the island of Sulawesi.
Two-foot-long cloud rat rediscovered after missing for forty years in the Philippines
(04/17/2012) Czech computer programmer, Vaclav Rehak, was the first person to see a living Dinagat bushy-tailed cloud rat (Crateromys australis) in nearly forty years, reports GMA News. Rehak was traveling on Dinagat Island with his new wife, Milada Rehakova-Petru, a specialist on Philippine tarsiers, when he stumbled on the rodent, which has only been recorded once by scientists in 1975. Found only on the Dinagat Island, the rodent was feared extinct, but is now imperiled by mining concessions across its small habitat, which is thought to be less than 100 square kilometers.
Cute baby animal photos of the day: twin Malagasy giant jumping rats born at London Zoo
(02/28/2012) Twin Malagasy giant jumping rats (Hypogeomys antimena) were born in the Zoological Society of London's (ZSL) zoo in London this month. Found only on the island of Madagascar, also home to the world's lemurs, these rodents are the biggest on the island. These large rodents take the ecological place of rabbits in Madagascar, but unlike other rodents they form lifelong monogamous pairs and reproduce very slowly.
Giant rat plays big ecological role in dispersing seeds
(11/16/2011) Rats are rarely thought of as heroes. In fact, in many parts of the world they are despised, while in others they serve largely as food. But, scientists are now discovering that many tropical forest rodents, including rats, serve as heroic seed dispersers, i.e. eating fruits and nuts, and carrying seeds far from the parent tree, giving a chance to a new sapling. While this has been documented with tropical rodents in South America like agoutis and acouchis, a new study in Biotropica documents the first successful seed dispersal by an African rodent: the Kivu giant pouched rat (Cricetomys kivuensis), one of four species of giant African rats.
Cute animal picture of the day: baby mara, the giant rabbit that wasn't
(08/30/2011) The Patagonian mara (Dolichotis patagonum) may look remarkably like a rabbit—or like a rabbit on stilts—but this animal is more closely related to a guinea pig than a rabbit.
Cameratraps take global snapshot of declining tropical mammals
(08/17/2011) A groundbreaking cameratrap study has mapped the abundance, or lack thereof, of tropical mammal populations across seven countries in some of the world's most important rainforests. Undertaken by The Tropical Ecology Assessment and Monitoring Network (TEAM), the study found that habitat loss was having a critical impact on mammals. The study, which documented 105 mammals (nearly 2 percent of the world's known mammals) on three continents, also confirmed that mammals fared far better—both in diversity and abundance—in areas with continuous forest versus areas that had been degraded.
Photo: New mouse species discovered in Brazil
(07/06/2011) Researchers discovered a new species of mouse in Brazil, reports the Chico Mendes Institute for Biodiversity Conservation (ICMBio).
7 new mice species discovered in the Philippines
(06/16/2011) Seven new species of mice have been discovered in the rainforests of Luzon island in the Philippines, according to the country's Department of Environment and Natural Resources.
Red rodent shows up at Colombian nature lodge after 113 years on the lam
(05/18/2011) The red-crested tree rat (Santamartamys rufodorsalis) had not been recorded since 1898 and was thought possibly extinct—that is until one showed up at 9:30 PM on May 4th at a lodge in El Dorado Nature Reserve in northern Colombia. 'He just shuffled up the handrail near where we were sitting and seemed totally unperturbed by all the excitement he was causing,' said Lizzie Noble, a British volunteer with Fundacion ProAves.
New population discovered of the America's mini snow leopard: the Andean cat
(03/16/2011) The elusive Andean cat (Leopardus jacobita), which until the late 1990s was only known to scientists by a couple photographs, has been discovered beyond the Andes mountain range for which it is named. According to researchers, the wild Andean cat resembles Asia's snow leopard, both in appearance and its habitat above altitudes of 3,000 meters (9,800 feet), only in this case the wild cat is about the size of a domesticated feline. But, scientists have now discovered that the cat, which is listed as Endangered by the IUCN Red List, also inhabits the Patagonian steppe at elevations as low as 650 meters (2,100 feet).
Updating the top 100 weirdest and most imperiled mammals
(01/24/2011) A lot can change in three years. In January 2007, the Zoological Society of London (ZSL) jumpstarted a program unique in the conservation world: EDGE, which stands for Evolutionarily Distinct and Globally Endangered, selects the species it works with not based on popularity or fund-raising potential but on how endangered and evolutionary unique (in laymen's terms: weird) they are. When EDGE first arrived in 2007, it made news with its announcement of the world's top 100 most unique and endangered mammals. While this list included a number of well-known species—such as the blue whale and the Asian elephant—it also introduced the public to many little-recognized mammals that share our planet, such as the adorable long-eared jerboa, the ancient poisonous solenodon, and the ET-like aye-aye. However, after three years the EDGE program found that their top 100 mammals list already need updating.
Planting figs could save endangered species in Borneo
(06/28/2010) In one of the most remote and undisturbed forests of Borneo, the Maliau Basin in the Malaysian state of Sabah, researchers picked a single fig tree (Ficus caulocarpa) and surveyed the species feeding from it over a 5-day-period. Their findings, published in Tropical Conservation Science, shows that a fig tree over a short period of time feeds a high percentage of endangered species, prompting researchers to recommend replanting figs in disturbed forests as a way to save Borneo's frugivores (fruit-eating species) from extinction.
Study points to global snake decline
(06/09/2010) A number of reports over the last decade have shown amphibians, lizards, fish, and birds facing steep population declines across species and continents, providing further evidence that the planet is undergoing a mass extinction. Now a new study in Biology Letters adds another group of animals to that list: snakes.
Long-distance seed dispersal and hunting, an interview with Kimberly Holbrook
(05/24/2010) Scientists are just beginning to uncover the complex relationship between healthy biodiverse tropical forests and seed dispersers—species that spread seeds from a parent tree to other parts of the forest including birds, rodents, primates, and even elephants. By its very nature this relationship consists of an incredibly high number of variables: how abundant are seed dispersers, which animals spread seeds the furthest, what species spread which seeds, how are human impacts like hunting and deforestation impacting successful dispersal, as well as many others. Dr. Kimberly Holbrook has begun to answer some of these questions.
Diverse habitats needed for survival of small mammals in Mexico
(03/29/2010) A new study in Tropical Conservation Science shows that small tropical mammals in Mexico—bats and rodents—require a variety of habitats to thrive. Surveying mammal populations in the Isthmus of Tehuantepec, Oaxaca, Mexico, researchers found that sites comprising the greatest habitat diversity carried also the greatest diversity of rodents. In turn bats lived in all variety of habitats and moved easily from one to another.
Why seed dispersers matter, an interview with Pierre-Michel Forget, chair of the FSD International Symposium
(03/07/2010) There are few areas of research in tropical biology more exciting and more important than seed dispersal. Seed dispersal—the process by which seeds are spread from parent trees to new sprouting ground—underpins the ecology of forests worldwide. In temperate forests, seeds are often spread by wind and water, though sometimes by animals such as squirrels and birds. But in the tropics the emphasis is far heavier on the latter, as Dr. Pierre-Michel Forget explains to mongabay.com. "[In rainforests] a majority of plants, trees, lianas, epiphytes, and herbs, are dispersed by fruit-eating animals. […] As seed size varies from tiny seeds less than one millimetres to several centimetres in length or diameter, then, a variety of animals is required to disperse such a continuum and variety of seed size, the smaller being transported by ants and dung beetles, the larger swallowed by cassowary, tapir and elephant, for instance."
Global warming, not mass suicide, threatens lemmings
(04/20/2007) Lemmings, the rodents inaccurately believed to commit mass suicide by jumping off cliffs, are at real risk from climate change reports the Wildlife conservation Society (WCS). The Bronx Zoo-based group has just announced plans to study the impact of global warming on these creatures of the far North.
Strange spiny rodent discovered in the Amazon
(01/24/2007) Scientists have discovered a previously unknown species of arboreal rodent in the cloud forests of Peru. The species, named Isothrix barbarabrownae, is described in the current issue of Mastozoologia, the principal mammalogy journal of South America.
Forest protection best way to control rats finds study
(04/13/2006) The most cost-effective way to stop non-native rats and mongoose from decimating highly endangered species on larger tropical islands is not by intensive trapping, but instead by preserving the forest blocks where wildlife live, according to a study by the Bronx Zoo-based Wildlife conservation Society (WCS) and other groups.
Newly discovered rodent not so new or rare after all
(04/05/2006) The newly discovered species of rodent found in a marketplace in Central Laos turns out to not be so new or so rare after all. The Laotian rock rat (Laonastes aenigmamus), as the long-whiskered and stubby-legged rodent is now known, is a species believed to have been extinct for 11 million years. It is a member of a family that, until now, was only known from the fossil record. The species was first described by Wildlife conservation Society (WCS) researcher Dr. Robert Timmins after it was found on a table at a hunter's market in central Laos. In a return trip to the market, WCS conservationist Peter Clyne found the rats to be quite common, photographing several specimens. According to Clyne, the rat is commonly brought in by hunters and eaten by local people.
Bizarre rodent discovered in Southeast Asia; Oddity new to science
(05/11/2005) A team of scientists working in Southeast Asia have discovered a long-whiskered rodent with stubby legs and a tail covered in dense hair. But don't call it a squirrel. Or a rat. Because it's actually more like a guinea pig or chinchilla. But not quite. In fact the new species, found in Laos by scientists from the Wildlife conservation Society (WCS) and other groups, is so unique it represents an entire new family of wildlife.