Dr. Mark Willenbring at his Alltyr outpatient clinic for substance abuse in St. Paul.
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.
Two images of the same cuttlefish, taken fewer than two seconds apart, showing how quickly it can change color.
Cherry tomatoes. Researchers found that domesticated tomatoes like these were less resistant to whiteflies than currant tomatoes, a wild species.
A fossilized human jawbone discovered in Israel. The find may suggest that Homo sapiens first migrated out of Africa at least 50,000 years earlier than previously thought.
A leech, Haemadipsa zeylanica, in Thailand. Scientists have found they can survey the biodiversity of a forest with DNA analysis of leeches’ last blood meals.
Evidence of a cancerous tumor was found on a bone fossil dating back 1.7 million years.
A Chinese giant salamander, in a glass enclosure in Zhangjiajie, China. There are as many as eight distinct species, but farming is muddling them into a single hybridized population.
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.
One of five turbines that make up the Block Island Wind Farm, the first offshore wind farm in the United States, off the Rhode Island coast.
The Tremaster mirabilis starfish, one of several species of sea star living in deep waters off Greenland’s coast that have surprisingly complex eyes.
A mid-Cretaceous beetle had a cavity filled with hair at the base of its mandibles for collecting pollen from plants known as cycads.
The Sistine Chapel at the Vatican.
Fur seals can switch off and on R.E.M. sleep when they're in the sea and on land, a pattern never seen before. Scientists believe it might mean R.E.M. sleep helps generate heat in our skulls, like shivering for the brain.
Even though barn owls have simple brains, a new study suggests they can visually process objects in ways similar to that of animals with more sophisticated perception.
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