The native fauna include many birds, a few subspecies of which are endemic to the archipelago. Among land mammals the largest are Darwin's fox (named as such because Charles Darwin was the first to collect a specimen, on Isla San Pedro, Chiloé) and the pudú, a small deer. Marine mammals include Commerson's dolphins and South American sea lions which form colonies at rock outcrops close to the sea. Several species of whale have been sighted around the island, notably blue whales (see also Alfaguara project) and critically endangered southern right whales.