Spring-like temperatures this month could be the reason pairs of grebes were already on their artificial floating platform nests and incubating eggs at Lake Wanaka marina.
The first clutch of eggs hatched on platform No3 at the weekend.
Wanaka marina grebes project founder John Darby said the breeding season was two months earlier than usual and he suspected it could be due to the weather.
He said six of the eight nests had eggs.
Usually, there would be 14 floating platform nests, but several of the older ones had been removed in anticipation of eight newly designed nests being made at Mount Aspiring College.
Their arrival had been delayed due to the lockdown.
In the meantime, grebes were very active on Lake Hawea and floating platforms would soon be going into Lake Wakatipu.