People visiting Riversdale Beach are being urged not to walk among dunes south of the estuary and, if they must take dogs to the beach then to keep the animals on leads.
This is because a pair of endangered New Zealand dotterel has begun nesting at the beach, the southernmost breeding ground in the North Island and the Wairarapa branch of Forest and Bird wants to keep the nest safe.
According to the branch two dotterel chicks were successfully fledged last year "despite huge odds".
New Zealand dotterel numbers have severely declined in recent years and Forest and Bird said although two chicks may seem a small advance, it was nevertheless important.
Dotterels face many challenges from predators and people.