The bottlenose dolphin is one of the most common known members of ocean dolphins. Since their diets consist primarily of school fish, bottlenose dolphins are effected by environmental hazards that effect their food source as well as themselves. So when there are large oil spills, like one that happened in the Gulf Coast, it isn’t just the plants or small fish that are effected, it is all the marine life in the area. Bottlenose dolphins are also effected by the chemical perfluorooctanesulfonic acid, as it messes with their immune system. Cadmium and mercury are also known for causing kidney problems and cognitive issues for bottlenose dolphins. But the biggest problem is environmental changes. This can be harassment from humans, injures caused by nets or other things put into the ocean, water pollution, and the reduction of their food sources. Changes to their habits also can effect these dolphins, even if it is just the increase of freshwater into their saltwater habitats. Another issues that might be present, but has not been tested yet, is the concept that the raising water temperatures might effect reproduction rates for bottlenose dolphins. The US has banned dolphin hunting, however, this is not the case throughout the entire world and it is something that we all need to be aware of in our area and help to stop.