An exhibit opening at the Grand Rapids Public Museum gives visitors of a glimpse of the "Giants of the Deep."

It features rare specimens, and life-size and scale models of mammals common to the South Pacific.

The two items that may get the most attention are two fully-articulated sperm whale skeletons, including one that's 58-feet long.

The exhibit also features a life size replica of the heart of a blue whale, the Earth's largest living creature.