We recently revised (cooke et al. 2018) our abundance estimate for Maui dolphins, a sub-species of New Zealand’s endemic Hector’s dolphin (Hamner et al. 2012, Baker et al. 2016). The use of genetic mark-recapture techniques proved to be very useful in understanding the relatedness, ranging behaviour (Oremus et al. 2012), and population structure of these Critically Endangered dolphins. We documented the appearance of Hector’s dolphins from the east and west coasts, South Island in amongst the Maui dolphins which, if they interbreed, may ensure the future of these dolphins along the west coast of the North Island. This work is conducted in collaboration with Prof. Scott Baker, Oregeon State University.