Forestry Corporation ecologists have spent the week walking through Bondo State Forest near Tumut calling ‘hey frog’ – The most effective survey technique for detecting the critically endangered Northern Corroboree Frog. Amazingly, yelling ‘Hey Frog’ elicits a response from the frogs, which call out in response. Without this technique, the frogs would otherwise remain hidden in the wetlands, said Rohan Bilney, Senior Field Ecologist with Forestry Corporation. …“In late summer, the male corroboree frogs will call out in response to us bellowing “Hey frog” in a deep voice — they are usually sitting in their nest defending their territory,” Dr Bilney said. “So the survey method involves our ecology team essentially wandering through the swamps and bogs in the forest calling ‘hey frog’ to see how many we get calling back.”