There are potentially more than 30 marine mammal species (cetaceans and dugong) in the country occupying a variety of habitats. Marine mammals are some of the most widespread species in Philippine waters. However, human-caused problems in the marine environment have resulted in the decline of marine mammal populations, many of which have become threatened. Marine mammals have become victims of harvesting, poaching, by-catch, pollution, habitat degradation, disturbance, prey depletion, and even climate change.