An Australian species of pigeon produces a whistling sound with its wings to prompt others in the flock to flee from danger, researchers have found. Behavioural ecologist Dr Robert Magrath and student ...

An international team of researchers have discovered seven new species of tree frogs that make otherworldly calls in the rainforests of Madagascar. Their strange, high-pitched whistling calls sound ...

The North American walnut sphinx caterpillar produces a whistle that sounds just like a songbird's alarm call--and the whistle seems to startle birds. Christopher Intagliata reports. " Yeah it's ...