River gorge history highlights The glaciers melted 12,000 years ago, forming an immense amount of water to create our current rivers. Saint Anthony Falls was formed 12,000 years ago near what is now downtown Saint Paul. The falls receded upstream for 12,000 years to their current location near downtown Minneapolis.

Gulf of Mexico

Bull sharks can thrive in both salt and fresh water and can travel far up rivers. They have been known to travel up the Mississippi River as far as Alton, Illinois, about 700 miles (1100 km) from the ocean. However, few freshwater human-shark interactions have been recorded.

• No bull. In 1916, Americans were stunned by newspaper reports of a series of shark attacks in New Jersey.
• Garzilla. Possibly the most menacing-looking of Mississippi’s river monsters is the alligator gar.
• Uber cat.
• Triassic Park.
• The ‘freshwater shark’

Bull sharks are often considered to be the most dangerous sharks to humans because of their aggressive tendencies and ability to migrate up rivers. However, shark attacks are extremely rare. The sharks eat mostly fish, but can also eat other shark species, marine mammals, birds, and turtles.

“If… a shark bites you, what we recommend is you should hit the shark in the eye, in the nose, or stick your hand in the gills,” says Chris Lowe, of the California State University Long Beach Shark Lab, in an instructional video. “Those are all sensitive tissues and quite often it causes the shark to release.”

Great whites do not hunt by sitting on the bottom waiting for prey to swim above them, though they do swim generally near the bottom, cruising slowly, looking to ambush prey from below. Their hunting techniques are learned through experience, and in the Cape’s shallow waters they have adapted to attack seals laterally.

Dolphins also have the advantage of speed as they can swim faster than most shark species. Of course, the biggest advantage dolphins have over sharks is intelligence, especially through echolocation (when dolphins send sound waves through the ocean).

Great Whites and Manta Rays are among the most intelligent of the shark and ray species and are quite clever. But as far as we are aware based on what we know, are not on the same level that dolphins are. Sorry shark fans, but dolphins win here! Intelligence Winner: Dolphins!

There are a few theories about why orcas don’t attack humans in the wild, but they generally come down to the idea that orcas are fussy eaters and only tend to sample what their mothers teach them is safe. But orcas use echolocation to lock in on their prey.

Fatalities. While killer whale attacks on humans in the wild are rare, and no fatal attacks have been recorded, as of 2019 four humans have died due to interactions with captive killer whales. Tilikum was involved in three of those deaths.