Whales' methods of communication are complicated, and not yet well understood by scientists. Listen to examples of the vast differences in sounds that whales produce in these five recordings of whale vocalizations.
Recording 1: A humpback whale recorded March 22, 2003 at Isla Socorro, Revillagigedo Archipelago, Mexico. Credit: Danielle Cholewiak, PhD., Acoustic Specialist, Stellwagen Bank National Marine Sanctuary. NOAA/NOS
Recording 2: A humpback whale. Credit: Sofie Ban Parijs, Northeast Fisheries Science Center, NOAA Fisheries Service.
Recording 3: A sperm whale echolocating. Courtesy of the Scripps Whale Scoustic Laboratory.
Recording 4: A right whale. Courtesy of the Scripps Whale Scoustic Laboratory.
Recording 5: Another right whale. Courtesy of the Scripps Whale Scoustic Laboratory.
A daunting story of shipwreck, starvation, mutiny and cannibalism amongst a group left abandoned in the high Arctic.
When an earthen dam broke without warning, a small city in Pennsylvania was swept away in a wall of water over 30 feet high.
The most daring and innovative accomplishment at the turn of the 20th century.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.
The life of the legendary photographer, known best for his black and white images of the wilderness of the American West.
A personal story of one family's dramatic effort to hold onto their family farm in Iowa as massive foreclosures sweep the nation in the 1990s.
Before radar had been invented a devastating hurricane hit America, surprising residents of the East Coast and killing more than 600 people.
In 1927, the Mississippi River flooded from New Orleans to Illinois, leaving a million people homeless and leading to a major black migration to the North.