South American Sea Lion

Photo: Matteo · CC BY-NC

South American sea lions haul out on the Ballestas rock shelves in colonies of hundreds, and their underwater behaviour transforms entirely once they enter the water — twisting, spiralling, and blowing bubble rings around divers with tireless playfulness. Males can reach 300 kilograms, but it is the juveniles that most enthusiastically interact with dive bubbles and camera equipment. The colony's presence is intrinsically linked to the Humboldt Current anchovy schools that sustain them, making the Ballestas a keystone site for understanding the entire Peruvian marine food web.