A low-flying helicopter sparked a mating frenzy at a crocodile farm in Australia. It's currently courtship season for saltwater crocs on the continent. The crocs may have mistaken the chopper's sound ...

Helicopters have one of the most recognizable sounds in aviation. The signature "whop whop" or deep thumping sound announces its arrival long before it appears in the sky. It's a sound so iconic, it's ...