"That was the first successful season we've had them breeding on the pond, which was really amazing."
But there hasn't been any breeding dabchicks on the pond since and that's worrying for Pottinger because the dabchick population was in decline, and already extinct in the South Island.
"They're vulnerable to pests like all native birds, but they're also vulnerable in the way that they have their nests," he said.
"Their nests are made of floating vegetation, just on the side of banks on a lake would be their best environment, where there's stable water."
This left the nests vulnerable to waves from boats, which destroy the nests.
"Really, the only safe environment they've got left are farm ponds or sand dune lakes which boats aren't allowed on."
Pottinger said putting in his farm pond was part of a bigger vision for the property - planting trees and retiring unproductive pasture to help lower the farm's impact on the environment.
"That's all been done in the first three years," he said. "Just to improve it for the future and reduce that risk of erosion and sediment loss."
The arrival of the dabchicks was unexpected and welcome.
"[We're] quite a bit away from where they are usually so for them to turn up here is quite a bit of a bonus for what we've created."
They're hopeful that other farmers will follow their example in protecting New Zealand's precious pastures, and inadvertently native birds.
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