Marine Ranger is a citizen science application enabling collection of information on opportunistic observations of live, injured or by-caught cetaceans (whales and dolphins) and other marine mammals. Marine mammals are globally endangered, and everyone can help to protect them. By getting involved, sharing your observations, and following what others are reporting you can become immersed in daily issues of marine mammal conservation. Your reports and observations will help us identify threats and areas of interactions with dolphins, whales and seals and act swiftly in case of emergency. Your participation can help scientists and managers develop better measures for conservation of marine mammals. With your support, we aim to ensure a better future for all marine mammals!