Many different species do similar things. The pencil sea urchin and green sea urchin, for example, are both grazers in the coastal waters of the Galapagos Islands.
Scientists found that the tough exteriors of cockroaches help them keep moving without losing much momentum when they bump into things.
Illustrations by R. Kikuo Johnson
Dr. Mark Willenbring at his Alltyr outpatient clinic for substance abuse in St. Paul.
Pronghorn antelope along a fence northwest of Casper, Wyo. A study has found that wildlife move far less in regions where humans are present, ultimately threatening the viability of a species.
Wild dogs, apex predators missing from Gorongosa National Park for decades, have been reintroduced and are slowly making a comeback, part of an ongoing experiment in reviving the park ecosystem after years of devastating war.
A transparent hatchetfish, retrieved by researchers from the Woods Hole Oceanographic Institution, which is seeking to understand better the creatures that occupy the sea from 600 to 3,300 feet deep.
A male chimpanzee drinking at a waterhole in Fongoli, a Senegalese savanna. Temperatures at Fongoli can reach 110 degrees Fahrenheit or more.
The view from the summit of "Mount Thoreau" looking south toward the Palisades and the Northern boundary of Kings Canyon National Park.
A specimen of the Chimerarachne yingi, an ancient relative of spiders that had a long, whip-like tail that was probably used as a sensory organ.
An Oriental fire-bellied toad, which was imported into Europe from South Korea.
A juvenile male humpback whale in waters off Sri Lanka. The males may be singing certain tunes to attract mates, although scientists listening to the songs suspect there may also be other reasons for the music shared among these giants, even when they are miles and miles apart.
An artist’s rendering of the European Space Agency’s Mars Express spacecraft searching the planet’s south pole for liquid water.
Calestous Juma in 2004. His championing of sustainable development in sub-Saharan Africa was informed by his arduous childhood in a poor village there.
A nearly 9-foot slab of rock found in a parking lot on the grounds of NASA’s Goddard Spaceflight Center holds the fossilized tracks of several dinosaurs and even a few early mammals.
The success of this launch gives SpaceX momentum to begin developing even larger rockets, which could help fulfill Elon Musk’s dream of sending people to Mars.
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