Nearly two-thirds of coral reef sharks threatened with extinction from overfishing as main cause, study finds

The study, published in Nature Communications, shows that 59% of the 134 coral-reef associated shark and ray species are being threatened with extinction, making them the most threatened groups found on coral reefs alongside marine mammals.

Dinosaur fossils unearthed in Chile may give insight into deadly asteroid strike

The new fossils are from birds and killer dinosaurs, such as the megaraptor, and provide clues about their life before — and after — the fatal asteroid strike.

Massive seal running amok in Australia town

A large seal was captured on video running through a small town in Australia this month. 

Watch: Drone video captures the world’s largest hatching of baby turtles

Between mid-December and early January, millions of baby river turtles emerged from the sandy beaches of the Amazon’s Guaporé/Inténez River.

Polar bear emerged unseen from Alaska snowstorm to kill woman, baby

As the attack unfolded outside a school, the principal ordered a lockdown and closed the blinds so the children couldn’t see what was happening outside the entrance.

Feds: Offshore wind not to blame for East Coast whale deaths

Federal environmental and energy officials moved Wednesday to quell a growing controversy over whether work done by the offshore wind power industry is killing whales in the northeastern U.S., saying there is no evidence this is happening.

3 grizzly bears in Montana tested positive for bird flu, euthanized last fall

Highly pathogenic avian influenza (HPAI) is a strain of the influenza virus that primarily infects birds, but can also infect humans. The virus is highly contagious and can be deadly.

Groups: 'No evidence' offshore wind killing whales in NJ-NY

Environmental and fishing groups said Tuesday there is "no evidence" that site preparation work for offshore wind farms in New Jersey and New York is responsible for a spate of whale deaths in the two states.

USDA approves vaccine for honeybees, a first in the U.S.

Scientists say the vaccine will protect them from disease that can ravage colonies in as little as three weeks.

WATCH: Hawaii’s Kilauea volcano erupts again

The U.S. Geological Survey said Thursday that Hawaii's Kilauea began erupting again. 

Scientists find signs of Alzheimer's in dolphin brains

In total, 22 dolphin brains were studied in which researchers noted that the animals presented alterations in their brain chemistry, changes most commonly found in humans who have Alzheimer's.