R.B. Simpson discovered in 1940 that Miranda was a feeding ground for large numbers of wading birds. Since then ornithological societies have censured the numbers and found that 5-6,000 lesser knots and 7-10, 000 bar tailed godwits travel here during the summer months before departing to the Siberian and Alaskan feeding grounds. In addition over 20, 000 South Island pied oystercatchers and 300 wrybills spend the summer months here after breeding the South Island. Many more birds can also be found here and the Miranda Shorebirds Centre has lectures and displays.
The shoreline of Miranda itself is also very unique and is considered the finest example in the world of an active sand and chenier plain. The Hunua ranges to the east mark the original shoreline about 4000 years ago and since then continuous tidal and wind action has deposited shell ridges to form the land or coastal plain you see today.