On Monday morning, we spent about three hours out on the Amazon and some of its tributaries. The first thing that we did was to look (successfully, I might note) for fresh water “pink” dolphins. They’re called pink dolphins because, while they’re normally grey, they turn pink when hunting or agitated. This occurs because the blood rushes to their capillaries, which are very visible in their dorsal fins. There are also freshwater gray dolphins who don’t change... Read more