As a relatively small and isolated oceanic island, Norfolk has few land birds but a high degree of endemicity among them. Many of the endemic species and subspecies have become extinct as a result of massive clearance of the island's native vegetation of subtropical rainforest for agriculture, hunting and persecution as agricultural pests. The birds have also suffered from the introduction of mammals such as rats, cats, pigs and goats, as well as from introduced competitors such as common blackbirds and crimson rosellas. COUNT 5
QSN1 What type of bird does Norfolk Island have few of? ANS1 land QSN2 What is one reason that has caused many of the birds of Norfolk Island to become extinct? ANS2 massive clearance of the island's native vegetation QSN3 What is the second thing that caused many of the birds of Norfolk Island to become extinct? ANS3 hunting and persecution as agricultural pests QSN4 What non-bird animals caused the bird populations of Norfolk Island to suffer? ANS4 mammals QSN5 What non-native birds caused the bird populations of Norfolk Island to suffer? ANS5 common blackbirds and crimson rosellas