Everglades mangroves also serve as nurseries for crustaceans and fish, and rookeries for birds. Mangroves also serve as excellent rookeries for birds. These activities occur at rookeries that are located on offshore islands or remote mainland beaches. There are currently three functioning breeding rookeries on the Auckland Islands. Numerous reserves and protected areas at rookeries and haul-out sites exist for the sea lions. Edging the fur seal rookeries, the two species cohabit easily. It reportedly supported one of the largest wading bird rookeries in South Florida. Kellow Chesney gives a whole chapter, "Citadels of the Underworld", to the rookeries of London. The Gulf of Mexico provides access to smaller tropical islands, rookeries, and sports fishing grounds. The rookeries Pribylov visited held upwards of four million seals, for which they became famous. It is one of the largest wading bird rookeries in the state. They return to their rookeries and breeding takes place in spring. It has rookeries for the little penguin "Eudyptula minor". Rather than aggregate in reproductive rookeries, females haul out on ice to give birth singly. Sharpe was born a guttersnipe in the rookeries of London but grew up in Yorkshire.