The oyster catcher nest on the main Mount beach has come through another high tide intact, thanks to a wall of sandbags placed on the seaward side.

The fortifications come after the nest was threatened by the high tide last week.

The pair of oyster catchers, known locally as Harry and Sophie, are taking turns sitting on the nest. One sits while the other goes up and down the beach looking for food.

Nearby are two pairs of dotterels, another threatened and nationally vulnerable New Zealand bird species.

The area is roped off and clearly marked with a sign, to help keep the birds safe during this busy time of year.