These are the 28 invasive insect species of 'greatest concern' in Pennsylvania

The Commonwealth of Pennsylvania has cataloged 28 invasive insect species that threaten forests, agriculture and ecosystems – with many already spreading in Pennsylvania landscapes.

Yellowstone National Park trail shut down after first bear attack in 4 years

Grizzly bears and black bears coexist in Yellowstone, according to the National Park Service, and it's unclear which one was involved in the attack.

Hikers on psychedelic mushrooms rescued after getting lost in NY mountains

A hiking trip took a “trippy" turn that ended with a group having to be rescued from a popular mountain destination in New York State last month.

Arkansas man, 72, mauled by 70-pound bear

The man suffered extensive injuries to his face and upper body before being airlifted to a hospital.

Man dies in shark attack at Sydney beach

A man in his 50s was killed by a large shark while surfing at a beach near Sydney, Australia on Saturday.

Rare manatee sighting in Texas temporarily halts $64 million construction project

According to the Texas Marine Mammal Stranding Network, sometimes West Indian Manatees migrate from Florida to Texas in the summer. These sightings are still rare.

Watch: Video shows rare fish's ability to climb rocks

The tiny fish were seen swimming, or rather "climbing" up rocks, a behavior that hadn't been seen before.

Oldest-ever Great Lakes lake trout recorded in Lake Superior

The best way to measure how old a fish is is by counting the number of rings formed on a chunk of calcium living in its inner ear. This lake trout, named Mary Catherine, had 62 rings.