* Dusky dolphin (Lagenorhynchus obscurus): This is the most common dolphin species in New Zealand waters. They are typically seen in groups of 10-50, and they can be found all around the country's coastline.
* Hector's dolphin (Cephalorhynchus hectori): This is the smallest and rarest oceanic dolphin in the world, and it is found only in New Zealand waters. There are two subspecies: Hector's dolphin and the Maui's dolphin, which is critically endangered and found only in the North Island.
While these are the most common, you might also occasionally spot other species like:
* Common dolphin (Delphinus delphis): Usually found further offshore in the Tasman Sea.
* Bottlenose dolphin (Tursiops truncatus): Seen more often in the warmer waters of the north.
* Orca (Orcinus orca): Found in both the north and south, though not as common as dusky dolphins.
So, while the most common dolphins in New Zealand waters are Dusky dolphins and Hector's dolphins, you may be lucky enough to see other species as well.