SPERM WHALES PRODUCE FOUR DISTINCT vocalization patterns: normal clicks, for tracking down prey at distances of more than a mile; creaks, which sound, despite their name, like machine-gun fire, for homing in on close-range prey; codas, the patterns used during social interactions; and slow clicks, which no one quite understands. One theory is that bulls use slow clicks to attract females and scare off other males. The clicks are very similar to dolphin clicks but more complex.
