In terms of sheer diversity, the shorebirds take the crown on St. Paul with an incredible 64 species recorded on the island within the past three decades. Only four shorebirds nest, whereas the remaining 60 species are either regular spring or fall migrants, rare visitors, or exceptional rarities with only one or two occurrences.
The Northern Territory makes up about a sixth of Australia. You could fit Britain into it six times over; yet it has a population of just over 200,000 people. Need we say more?
Birding trip report for the Western Cape in South Africa, October 2012 (Birding Ecotours)