Coral reef bleaching may be easing after three years of high ocean temperatures, the longest such period since the 1980s, the National Oceanic and Atmospheric Administration said on Monday.

The Amazon River is known far and wide for its vast array of wildlife ranging from pink dolphins to flesh-eating piranhas and has now revealed a new treasure trove - a massive coral reef that stretches for some 600 miles, scientists say.

An extensive aerial and underwater survey has revealed that 93% of Australia's Great Barrier Reef has been affected by coral bleaching.