First, the whale has to provide a sound. Toothed whales don’t have something exactly like our vocal cords, although they have similar buildings. It’s thought that they produce their sounds in their nasal passages [supply: Hebridean Whale and Dolphin Trust]. The melon, the fatty structure we mentioned earlier than, then focuses these sounds into a beam before sending them out. The sound waves then journey until they hit something, at which point the echoes bounce again to the whale. The whale receives these echoes both within the decrease jaw or straight within the skull, relying on the frequency of the sound [supply: Hebridean Whale and Dolphin Belief]. Every species has a unique range of frequencies, depending on what they need echolocation for — low-frequency sounds go farther, whereas high-frequency sounds are suited to short distances. From the echoes, the whales can decide where their meals is, amongst other things.

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Secure Passage: There and back again Kelly concludes the Secure Passage story line with an examination of what worked, what did not, and her inventive course of. I loved Secure Passage, not just because it was a great story and comedian in its own right, but because it brought the sobering and complicated classes of the Alliance/Horde clash within the Barrens to vivid life.