The intertidal mud and sand flats support high densities of benthic invertebrates, providing a key food source for waders or shorebirds. The site is one of the most important migration staging, and non-breeding, areas for waders in Australia and within the East Asian – Australasian Flyway. It is a principal spring arrival site in August–October for large proportions of the Australian populations of many species, and especially for the larger ones that travel non-stop from China to Australia. There is high turnover due to the birds moving onwards to south-western and south-eastern Australia, though large numbers remain through summer, and smaller numbers of non-breeding birds stay through winter. The area is also important for the northward movement of waders in autumn, with massed daytime departures taking place in March–April. The total number of waders using the bay each year is estimated to be over 300,000. The northern beaches of the bay, as well as Bush Point, provide important high tide roost sites.