Monthly bird counts were carried out at Lake Wainono, South Canterbury, from August 1968 to April 1978. Highest numbers of birds were at the lake from January to April because of a post-breeding increase in numbers of 18 common species. Six species reached peak numbers during the winter and only five during spring and early summer. Since 1968 White-faced Herons (Ardea novaehollandiae
) have declined in numbers, whereas Paradise Shelducks (Tadorna variegata
), Spur-winged Plovers (Vanellus miles novaehollandiae
) and Black-backed Gulls (Larus dominicanus
) have increased in numbers.