Ocean Park visitors who love 'water babies' are having a great 2011. Earlier this summer, two female sea lion cubs were born. Meanwhile in March, a bottlenose dolphin called Angel gave birth to Angelo. When he was 10 days old, Angelo already weighed 14kg. He now weighs more than 50kg and is eating 10kg of fish a day. He also receives milk from his mother. He will continue to drink her milk for the next two or three years. In four months time, another bottlenose dolphin called Gina is due to give birth to a calf. Five facts to know about DOLPHINS 1 Dolphins are mammals not fish. 2 They communicate with each other using sounds and whistles. 3 Dolphin calves stay with their mothers until they are six years old. 4 A group of dolphins is called a pod. 5 Dolphins can live for up to 50 years.