Sperm whale dies after being entangled in rope off Skye / Sperm whale entangled in rope dies after stranding / Sound provides new information about the secret lives of sperm whales / Inside Cecilia Vega's first 60 Minutes story on sperm whales / Sperm whale families talk a lot. Researchers are trying to decode what they're saying / What are sperm whales saying? Researchers find a complex 'alphabet' / Ontario scientist helped decode the sperm whale 'phonetic alphabet' -- a major step toward communicating with another species / Sperm whale communication could be remarkably close to human languages, scientists say / Scientists discover sperm whale 'phonetic alphabet' / Sperm whale clicks could be the closest thing to a human language yet