The first-ever sounds of sharks have been captured by researchers, according to a new study published in the journal Royal Society Open Science. The study, published Wednesday, found that the rig shark--also known as the spotted estuary smoothhound--produces clicking sounds when handled, according to the study." Sharks are maybe not as silent as we thought," Carolin Nieder, marine biologist at Woods Hole Oceanographic Institution and lead author of the study, told ABC News. Nieder said the sound