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.

Spider infestation temporarily shuts down Wisconsin middle school

A letter sent out to parents by the school identified the spiders as yellow sac spiders, a common species in the United States.