Ferret (IMAGE) Ecological Society of America Caption New Zealand shorebirds evolved without having to worry about mammalian predators like this invasive ferret. Olfactory cues helps hide eggs and keep them safe from predation. Credit Grant Norbury Usage Restrictions Credit Grant Norbury / Ecological Society of America License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.