On Jan 1 2008 I first heard and then saw a huge flock of Sandhill cranes pass overhead, Any one else?

When I visit at my parents' farm in South Texas (Dimmit County), I periodically hear the calls from a passing flock of sandhill cranes before I notice them. The low frequency sound of the sandhill cranes calls carries well, especially in still air. Some of the flocks I have heard appear to be at least a mile away. An interesting call that both male and female sandhill cranes perform while on the ground is called the "unison call". The cranes will bow down, then suddenly jump in the air and spread their wings while emitting a call, which sounds different than the repetitive type call while flying. One possible reason for this call, is to perhaps reduce stress in the flock. See my photo of sandhill cranes performing a "unison call" at www.texaswildlifephotography.com