Jurong Bird Park can be seen here — the hyacinth, Lear's and Spix's. Houses five species of penguins within . Featuring a tall Portuguese galleon façade and designed to resemble a ship, the interior of Penguin Coast is constructed with timber beams and wooden flooring. Penguin Coast is home to the Humboldt, rockhopper, macaroni and king penguins, which live in an indoor, climate-controlled den with access to an outdoor enclosure showcasing African penguins, African darters and Hartlaub's gull. Asia's first nocturnal bird house featured a system of reverse lighting, converting day to night and vice versa. On display were 60 birds from 17
Northern rockhopper penguin drop in the population at Gough Island has been described as equivalent to the loss of 100 birds every day since the 1950s. A study published in 2009 showed that the world population of the northern rockhopper had declined by 90% since the 1950s, possibly because of climate change, changes in marine ecosystems and overfishing for squid and octopus by humans. Other possible factors in the decline include disturbance and pollution from ecotourism and fishing, egg-harvesting, and predation and competition from subantarctic fur seals ("Arctocephalus tropicalis"). Surveys show that the birds are at risk of infection by goose barnacles. House