Friendships among male bottlenose dolphins can last a lifetime. | National Geographic

Bottlenose Dolphin (Tursiops truncatus) For the next instalment of our deep dive series, we're taking a closer look at the Bottlenose Dolphin, which is the most commonly reported cetacean here in Sussex. Adults can grow up to nearly 4 metres long. They have a large grey body, a pale grey or pinkish belly and a tall sickle-shaped dorsal fin. Bottlenose Dolphins are commonly seen in groups of 2-15 individuals. However, large groups and single dolphins are not uncommon. These animals are playful an