Alderney and its surrounding islets support a rich flora and fauna. Trees are rather scarce, as many were cut down in the 17th century to fuel the lighthouses on Alderney and the Casquets. Those trees that remain include cabbage trees, due to the mild climate – often miscalled "palms" but of the asparagus family), and there are some small woods dotted about the island. Puffins on Burhou and gannet on Les Étacs (popularly called Gannet Rock) just off Alderney are a favourite of many visitors to the island.