Abalone are marine snails much sought after for their meat in Asia, and also for their decorative shells.
Fossil records suggest abalone have changed little over millions of years.
But their simple, largely static lifestyle, and preferred habitats of relatively shallow areas along the coastline mean they are easily caught; their only means of defence is to stick tightly to rocks.
New Zealand is home to several unique species of abalone - known by the Maori name paua.
Their nacre (mother of pearl) shells have been a traditional component in Maori art and their flesh has been eaten since New Zealand was first settled.