News tagged with rodent
Scientists investigate how chemicals evolved into communication signals
(PhysOrg.com) -- Living things possess many diverse ways of communicating, but perhaps the oldest and most widespread form of communication involves the use of chemicals. From animals and plants to bacteria ...
Jan 11, 2011 |
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Some mammals used highly complex teeth to compete with dinosaurs: study
Conventional wisdom holds that during the Mesozoic Era, mammals were small creatures that held on at life's edges. But at least one mammal group, rodent-like creatures called multituberculates, actually flourished ...
Other Sciences / Archaeology & Fossils
Mar 14, 2012 |
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Helping your fellow rat: Rodents show empathy-driven behavior
The first evidence of empathy-driven helping behavior in rodents has been observed in laboratory rats that repeatedly free companions from a restraint, according to a new study by University of Chicago neuroscientists.
Dec 08, 2011 |
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Oldest fossil rodents in South America confirms animals from Africa
In a literal walk through time along the Ucayali River near Contamana, Peru, a team of researchers found rodent fossils at least 41 million years old – by far the oldest on the South American continent.
Other Sciences / Archaeology & Fossils
Oct 12, 2011 |
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Mole rat dental structure similar to a shark
(PhysOrg.com) -- Sharks are capable of continually growing new teeth. As the teeth age, they fall out and new ones move forward similar to that of a tooth conveyor belt. Humans, and most mammals, on the other ...
Oct 11, 2011 |
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With secondhand gene, 'freaky mouse' defeats common poison
Over millennia, mice have thrived despite humanity's efforts to keep them at bay. A Rice University scientist argues some mice have found two ways to achieve a single goal -- resistance to common poison.
Jul 21, 2011 |
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Better viewing through fluorescent nanotubes when peering into innards of a mouse
Developing drugs to combat or cure human disease often involves a phase of testing with mice, so being able to peer clearly into a living mouse's innards has real value.
Nanotechnology / Bio & Medicine
May 27, 2011 |
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Can't focus? Maybe it's the wrong time of month
Feeling a little sluggish and having trouble concentrating? Hormones might be to blame according to new research from Concordia University published in the journal Brain and Cognition. The study shows that high estrogen levels ...
Medicine & Health / Neuroscience
Sep 24, 2010 |
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Viral phenomenon: Ancient microbe invaded human DNA
Humans carry in their genome the relics of an animal virus that infected their forerunners at least 40 million years ago, according to research published Wednesday by the British science journal Nature.
Jan 06, 2010 |
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Scientists discover gene that 'cancer-proofs' rodent's cells
(PhysOrg.com) -- Despite a 30-year lifespan that gives ample time for cells to grow cancerous, a small rodent species called a naked mole rat has never been found with tumors of any kind—and now biologists ...
Oct 26, 2009 |
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House mice put endangered petrels at risk of extinction
Common house mice are demolishing what could be the only breeding population of endangered Atlantic petrels in the world, scientists have found.
May 16, 2012 |
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Big-mouthed babies drove the evolution of giant island snakes
Some populations of tiger snakes stranded for thousands of years on tiny islands surrounding Australia have evolved to be giants, growing to nearly twice the size of their mainland cousins. Now, new research ...
May 15, 2012 |
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Magnetic nanochain detonates chemo barrage inside tumors
Medicine-toting nanochains slip into tumors and explode a chemotherapy drug into hard-to-reach cores of cancer, engineers and scientists at Case Western Reserve University report.
Nanotechnology / Bio & Medicine
Apr 18, 2012 |
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New study traces the evolutionary history of what mammals eat
The feeding habits of mammals haven't always been what they are today, particularly for omnivores, finds a new study.
Apr 16, 2012 |
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Huge hamsters and pint-sized porcupines thrive on islands
From miniature elephants to monster mice, and even Hobbit-sized humans, size changes in island animals are well-known to science. Biologists have long believed that large animals evolving on islands tend to get smaller, while ...
Mar 23, 2012 |
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Rodent
Sciuromorpha Castorimorpha Myomorpha Anomaluromorpha Hystricomorpha
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing.
Forty percent of mammal species are rodents, and they are found in vast numbers on all continents other than Antarctica. Common rodents include mice, rats, squirrels, chipmunks, gophers, porcupines, beavers, hamsters, gerbils, guinea pigs, degus, chinchillas, prairie dogs, and groundhogs. Rodents have sharp incisors that they use to gnaw wood, break into food, and bite predators. Most eat seeds or plants, though some have more varied diets. Some species have historically been pests, eating seeds stored by people and spreading disease.
For more information about Rodent, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
