In a small patch of rainforest in northern Australia, a “bright”-eyed creature perched on a bush and called out. Its “whirring” sounds were meant to attract potential mates — but hooked nearby ...

So, if you can hear the male call, you can tell the difference. The Cope’s gray tree frog has a faster thrill that lasts shorter than the gray tree frog. But the rates in which both frogs call ...