[5] The Peñón Pachacámac island, also called San Francisco islet, is shaped like a sugarloaf and is the second largest with an area of 7.05 hectares.

The Pachacámac Islands are an important breeding site for seabirds such as red-legged and neotropic cormorants, Peruvbian boobies and Humboldt penguins.

[3] Other birds present include guanay cormorants, Peruvian pelicans, Inca terns, Belcher's, kelp, grey, grey-headed and Franklin's gulls, turkey vultures, and American and blackish oystercatchers.

The islands have been designated an Important Bird Area (IBA) by BirdLife International because they support significant populations of seabirds.

The underwater world of the Pachacámac Islands shows an impressive landscape and a lot of life, where fish and marine invertebrates are the most representative taxonomic groups.