Nat Geo Explorer, marine biologist, and conservationist Fernando Trujillo has spent more than 30 years researching the river dolphins of South America: the boto, also known as the pink river dolphin, and the tucuxi. These endangered aquatic mammals are important indicators of ecosystem health and are in need of global and concerted action to protect them. Today on International Freshwater Dolphin Day, Trujillo and other experts, ministers, senior officials, and representatives from South America