LiveScience: A huge population of rare dolphins threatened by climate change and fishing nets has been discovered in South Asia. Researchers with the Wildlife Conservation Society estimate that nearly 6,000 Irrawaddy dolphins, marine mammals that are related to orcas or killer whales, were found living in freshwater regions of Bangladesh’s Sundarbans mangrove forest and adjacent waters of the Bay of Bengal. There has been hardly any marine mammal research done in this area up to this …