Consider the following statements about the Dolphin.
1. Dolphins are animals of aquatic ecosystems.
2. They are found only in freshwater.
3. Irrawaddy Dolphins are found in brackish waters of Odisha.
4. Gangetic Dolphin is the only species identified for taking up ‘Recovery programme of Critically Endangered Species, under the Centrally Sponsored Scheme of ‘Integrated Development of Wildlife Habitat.
Which of these statements is/are correct?