Browse Items (1434 total)

in 240 B.C., Eratosthenes calculated the earth's circumference in Alexandria using geometry and reports of the sun's position directly over Aswan, Egypt, at the summer solstice.

An 'Urban refugee,' destined for relocation, is carefully towel dried.

slippery, soapy, and fighting mad, the prairie dogs are quickly cleaned and caged. They will be relocated to new site outside of Denver.

a rescue group relocates a threatened colony of 75 prairie dogs from a growing subdivision near Denver. Soapy water is pumped into the burrows, fleshing out the animals.

Big wheels flatten a prairie dog colony at a Denver construction site. Developers traditionally plowed over or poisoned the entire colonies, but due to growing criticism, they started to use prairie dog rescue and relocation groups.

Two marked ' Utah males' explode in a duel for territorial dominance and breeding females, at Bryce Canyon. Skirmishes are bloody, but rarely fatal.

Hoogland paints an ID number on a young pup at Bryce canyon. Then, in a tower using binoculars, he will record all the behavioral activity of over 80 prairie dogs, everyday, from March to July.

Veteran researcher Dr. John Hoogland is the country's leading authority on prairie dog behavior. Every spring for the last 25 years he has trapped entire colonies, and marked them for identification.

The 'Utah species' is the only prairie dog on the threatened list; and also the only one that hibernates. Hear, a young adult pops up from under a blanket of March snow, at Bryce Canyon, Utah.

this South Dakota rancher hates the site of prairie dogs; ' between the dogs and my cattle, it's a fight for grass, ' he says. Western ranchers have battled prairie dogs for over a century.