initial activity: shark or dolphin?. types of attacks scientists have defined two types of shark...
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Initial Activity: Shark or Dolphin?
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Types of Attacks
• Scientists have defined two types of shark attacks, one of which has three subcategories:
• Provoked attack – the human touches the shark, pokes it, teases it, or otherwise aggravates/provokes it in some way
• Unprovoked attack – Hit-and-run attack – Usually non-fatal, the shark bites and then leaves;
most victims do not see the shark.
– Sneak attack – Victim will not usually see the shark, and they may receive repeated deep bites. This is the most fatal kind of shark attack.
– Bump-and-bite attack – The shark bumps before biting and then normally swims away.
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• An incident occurred in 2011 when a 3-metre long great white shark jumped onto a 7-person research vessel off Seal Island, South Africa. The crew were undertaking a population study using sardines as bait, and the incident was judged to be an accident.
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Who is dangerous?
• Contrary to popular belief, only a few sharks are dangerous to humans.
• Out of more than 360 shark species, only four have been involved in a significant number of fatal unprovoked attacks on humans:
• the Great White, Tiger, Bull and Oceanic White tip
• These sharks, being large, powerful predators, may sometimes attack and kill people; however, they have all been filmed in open water by unprotected divers
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Preventing Attacks!• While there is no way to completely eliminate the possibility of a shark attack when one is in
the water, one may take precautions such as:
• avoiding the water at dawn, dusk, or night, when sharks tend to feed.
• avoiding areas such as murky waters and steep drop-offs
• avoiding swimming alone, always being near a group of people, and if possible, avoiding being at the edge of the group
• refraining from excess splashing or movement
• avoiding shiny jewelry, tan lines and bright clothing, all of which can attract sharks
• avoiding entering water if bleeding from an open wound
• avoiding areas where prey animals of sharks live, for instance seals
• sharks attack at 2-3 feet of water so remember to stay closer than that in shark infested waters.
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Natural Prey of Sharks
• Seals (pinnipeds)• Fish/Other Sharks• Crustaceans• Plankton• Marine Mammals• Birds• Sea turtles• And don’t forget…..
Different species of shark have different size and shape of teeth. Each is specialized for different functions!
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People Who Eat Peanut Butter Snickers!
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Things that Kill More People Than Sharks
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