Just three deaths from the oil spill ?that’s all it would take to push the sperm whales of the Gulf of Mexico to the brink. Hundreds are known to feed in the area of BP’s blowout. Host Jeff Young talks with marine mammal toxicologist Celine Godard-Codding and sperm whale expert Hal Whitehead about how the oil spill might affect these amazing whales, which have the largest brains and loudest voices in the animal kingdom.