Humpback Whales NPR''s Alex Chadwick reports on efforts to learn more about humpback whales at the Hawaiian Islands National Marine Sanctuary. This is a "Radio Expeditions" co-production with National Geographic. More information on whales is available at the website www.nationalgeographic.com.

Humpback Whales

Humpback Whales

Audio will be available later today.

NPR''s Alex Chadwick reports on efforts to learn more about humpback whales at the Hawaiian Islands National Marine Sanctuary. This is a "Radio Expeditions" co-production with National Geographic. More information on whales is available at the website www.nationalgeographic.com.