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A global treaty has extended trade protections to more than 70 shark and ray species whose numbers are in sharp decline.

GLP-1 drugs for pets could be the next frontier for the blockbuster weight loss and diabetes drugs.

Paid home care is buckling under the surging demands of an aging population. But there are alternatives that could upgrade jobs and improve patient care.

The slaty-masked tinamou, found in Brazil, is utterly unafraid of people. That could be its undoing, ornithologists worry.

While the president said he had a M.R.I. exam, a physician's memo released by the White House was less specific.

The employees had been suspended after signing a letter that accused the president of undermining the agency's ability to respond to hurricanes and other disasters.

The ability of Russia to launch astronauts to the International Space Station remains in limbo after an incident last week at the Baikonur base in Kazakhstan.

After the virus returned to Hawaii this fall, testing the shots in the endangered seal species became urgent.

Shifting politics, intensive lobbying and surging disinformation online have undermined international efforts to respond to the threat.

Less than 10 percent of heart and lung surgeons in the United States are women. At a recent conference, they vowed to change that.