The resident population of bottlenose dolphins in Sado estuary is a phenomenon in Portugal and rare occasion worldwide. No one clearly knows when they started to live there, but no less than 100 years ago.
Bottlenose dolphins can be found all over the world. They live in cold, temperate and tropical waters, and can just as easily be found in bays, coastal waters as in the open ocean.
In Sado they can be watched all year round however only during the summer months you can get into the water and enjoy snorkeling and swimming with these friendly mammals.