Mourning doves near Bear River, Nova Scotia, Canada (© Scott Leslie/Minden Pictures)

【December 14 2015】It’s the sad-sounding call that gives the mourning dove its name. But this bird – a relative of the now-extinct passenger pigeon – makes another notable sound. When the mourning dove takes flight, its wings produce a sort of whistle. The whistling wings may be a way to warn others of a nearby predator, but the sound is present during the entire flight, not just at takeoff and landing.Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..