The boats used for pearling from the 1870s, known as pearling luggers, were unique to Australia. There were at least two types: the Broome or North-West lugger, and the Thursday Island or Torres Strait lugger. The styles are each adapted to their respective areas and "modus operandi". Around Broome, the boats had to cope with the extreme tidal range and the shallow sandy shore, on which they had to spend extended periods lying on their sides. The Torres Strait luggers spent longer periods at sea, based around schooners as mother ships.