Bottlenose Dolphin
Bottlenose dolphins are a lot like humans. Some are happy to find a home and rarely ever leave it, while others prefer adventure and head off to travel the world. In fact Bottlenose Dolphins are found in more places than any other marine mammal.
They are regularly spotted in Sydney, but whether these are travelling nomads or residents to the area we're not too sure. If they are residents though they're definitely one of the oldest; living well into the 40s. (We will resist making any 'too old to be in school jokes').