The colony of bottlenose dolphins is composed of 30 individuals. This population is unique in Portugal, one of the very few in Europe living in estuaries. The bottlenose dolphin is an easy species to detect: It is approximately 2 to 4 meters long, it has a grey torso and a slightly lighter belly, a pronounced snout, and weighs between 150 and 600 kg. It feeds mainly on fish, cephalopods (cuttlefish, squid and octopus) and invertebrates. When searching for food bottlenose dolphins use their echolocation system for detecting prey. They may live for 30 to 40 years. All year round it is possible to watch dolphins on boat trips, with
departures from the marina of Troia, on Vertigem Azul and Sado Arrábida.