Baby dolphin die-off in Gulf: Cold water, not oil spill, the culprit?

The cause of death has not yet been determined for baby dolphins that have washed up by the dozen on beaches in Alabama, Mississippi, and Louisiana during the past two months. But cold water shock, which may have caused a spate of stillbirths, is one new theory to place alongside suspicions that the die-off is related to last year's Gulf oil spill.