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A porcupine is a rodent that is closely related to both mice and beavers. It is medium sized, weighing between 10 and 28 pounds and growing up to 20 inches long. More »

www.reference.com Pets & Animals Mammals

Porcupines are rodents with sharp quills that cover their entire bodies. One porcupine has as many as 30,000 quills on its back, sides and tail. More »

www.reference.com Pets & Animals Mammals Rodents

Polonium is the element with the most isotopes. That means that different atoms of polonium have different numbers of neutrons even as they have the same number of protons, which is 84. None of these 33 isotopes is stabl... More »

www.reference.com Science Chemistry Atoms & Molecules
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The name "armadillo" translates as "little-armored one," which refers to this creature's armor of protective plates. Armadillos are between 5 and 59 inches long, and weigh between 3 ounces and 120 pounds. They live in th... More »

www.reference.com Pets & Animals Mammals

Chipmunks are small squirrels that live throughout much of the northern hemisphere. There are 25 species, all but one of which live in North America. Depending on species, they grow to be 7.2 to 8.5 inches long including... More »

www.reference.com Pets & Animals Mammals

A fun fact about the sea otter, an aquatic member of the weasel family, is that despite being the smallest of all marine mammals, they actually have the thickest fur of any other marine mammal. The sea otter's coat can a... More »

www.reference.com Pets & Animals Mammals

Coyotes are clever, adaptable animals that can survive in almost any habitat in North America. They live in mountains, forests, deserts and even cities, and they eat a varied diet depending on what is available. More »

www.reference.com Pets & Animals Mammals