The notorious Asian carp has been found in the upper Mississippi.
A white shark nicknamed Lydia is the first of her species to be tracked across the Atlantic Ocean.
Paul Nicklen says the assignment that put him face to face with a toothy leopard seal "will stay with me forever."
Practice makes perfect, but mastery might require something more than 10,000 hours of trying.
A type of algae that's carpeting rivers and lakes worldwide is likely spreading due to our warmer climate, a new study says.