How do pink dolphins use camouflage in the amazon river?

Why are some streams very crooked while others are straight? When was African Burial Ground National Monument created? Whats the name of a mountain pass through which Aryans probably migrated? How many ocean animals are killed because of trash? What type of fault is the Mariana trench? What animals live at what height on mt Everest? What is the address of the Wright Brothers Museum? What was la purisima concepcion used for? What is the greatest problem facing the people in the world today? In 1792 which was the first state west of the appalachians? What is the second highest peak in the US? Do The surface areas of the ocean have abundant nutrients? What four mainland states border on the pacific ocean? What river was located in French territory just south of great lake? In witch ocean are there islands of Hawaii? Why aren't any the great lakes water? Were is a coral reef? What is the only country that doesn't dip its flag in the Olympics? What is the sea level of Lake Eyre? What are facts about the Daintree Rainforest?