Threats to Fairy Tern nesting include human disturbances such as trampling and noise, extreme weather events such as storms, and predation by animals including foxes, cats and dogs.
It is estimated that there are fewer than 3,000 breeding pairs in Western Australia and at least one quarter of those birds breed in the broader Perth metropolitan region.
Eggs and chicks blend in well with their surroundings making them vulnerable to trampling by humans and dogs.
Photo credit: Claire Greenwell, Fairy Tern chicks.