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Shark tracking reveals impressive feats of navigation

Harlequinmania

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Some shark species are able to navigate to specific locations up to 50 km away, a new study has found. Re-analyzing tracking data from tagged sharks, ecologists found that while some species such as blacktip reef sharks swim in a pattern known as a "random walk," others such as tiger sharks can at times hunt for prey or mates by using "directed walks," accurately navigating long distances across open ocean, often at night.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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