Archive for August 8th, 2013

August 8, 2013

Shark Week: Day 5

aug8

Bull sharks are unusual among sharks as they have developed special adaptations that help them keep salt in their bodies even when they are in freshwater.  Bull sharks have been found swimming in the Mississippi River as far north as Illinois as well as upstream in many other rivers around the world including the Amazon in South America.

Source: www.nationalgeographic.com