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4/9/2015

White Shark Jaws...Unhinged

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Picture
The upper jaw of the white shark is not fused to the skull. Instead, the jaws are slung loosely beneath the skull, held in place by flexible connective tissue and braced by accessory cartilages. Special muscles pull the jaw forward and down, riding on grooves on the undersurface of the skull. This arrangement allows this shark to protrude its jaws outward from the head, extending the reach of its teeth and creating a partial vacuum that helps suck in prey.  This comes into play when one considers the teeth.   The teeth have broadly triangular blades with coarsely serrated edges. The upper teeth are broader and flatter than the lower teeth, which reflects their different roles during biting. The lower teeth stab into and hold secure a food item while the saw-like upper teeth gouge out a hunk of flesh as the detached jaw extends forward and crashed down to meet the teeth holding the target in place. This dental arrangement allows the white shark to feed on prey too large to swallow whole as well as scoop out calorie-rich blubber from whale carcasses. 
The two photos (by #WSV cameraman MJ Billen) featured here show how a white shark's upper jaw can appear almost toothless until the jaw moves forward and down  to reveal the impressive teeth waiting within (image 2).

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  • Shark Blog
    • Watching Humans Blog
  • Monsters
  • About
    • Monsters - Project Overview
  • Education / Events
    • Presentations
    • Bookings
    • Feedback
    • Past Events >
      • Shark Night
      • Sharktoberfest 2018
      • Surfrider Sharktober 2018
      • Surfrider Foundation (San Mateo Chapter)
      • Night Life 2013 "Killer Personalities"
      • 7 Teepees
      • Great White Lies San Francisco Premiere
      • SF March Against the Cull
      • Great White Night 2012
      • Night Life 2011
      • Gentlemen's Club
      • Scuba Squad Divers
      • Sharks and Beer
      • Launch Party / Fundraiser
      • Of Whale and Man
    • FALSE CONSERVATION >
      • OCEARCH >
        • OCEARCH OVERVIEW
        • Internal Damage
        • Fin Damage >
          • Frodo's Fin Damage Timeline
        • OCEARCH's Pregnant Shark Not Pregnant
        • Science...without the Science
        • OCEARCH Videos >
          • Sinking Away
          • Not Stressed
          • Charlie Rose 1
          • Dorsal Fin Damage
          • PAT tags VS. SPOT tags
          • Tagging Options
          • Message to Australia
  • Videos
    • Stupid Things People Say About Sharks
    • Racism and Sharks
    • Connection
    • 360s Drones and Sharks
    • Footage Licensing
    • Tiger Shark Vs. Turtle
    • Guadalupe Cage Dive Guide
    • minioncam
    • Guadalupe White Sharks 2018
    • Product Reviews
    • Interviews >
      • Guadalupe 2018 Interview
      • Andre Rerekuru
      • RodneyFox
      • Chris Neff >
        • Cape Cod Cull
      • WalterBernardis
    • SharkMinutes
    • Kid Friendly >
      • Blueprint
    • Feature Films >
      • Monsters >
        • Enterprise Documentary Fund
      • Great White Lies >
        • Film Festivals >
          • Dropbox Links Great White Lies
    • Short Films >
      • Victory Over Sharks
      • Mothers and Children
      • Sentience
      • Elasmo
      • Shark Rescue
      • Balance
      • Shark Affection
      • Purpose
      • To Touch a Killer
      • Swimming In Shark Alley
      • White Shark Behavior: Part 1
      • Connection
      • Farallon Islands
      • Sustainable
      • Fear
    • Quick Bites >
      • Nurse Shark Barbels in Slow Motion
      • Do Sharks Get Cancer?
      • Sydney Harbor Video of White Shark is Fake
      • White Shark Swallows Tuna in One Bite
      • Gentle Biting and Ram Ventilation
      • Hammerhead Love
      • Seal Swims Leisurely Around White Sharks
      • Great White High Five
      • Petting a Nurse Shark
      • White Shark Tail Narrowly Misses Woman
      • Shark Shart ( Great White takes a shit )
      • WSV Preview
    • Elasmo >
      • Elasmo 0
      • Elasmo 1 and 2
      • Elasmo 3
      • Elasmo 3 Short Version
      • Elasmo 4 (Blue Sharks)
      • Elasmo 5 - Great hammerheads
      • White Dream (short)
    • Surf >
      • Surfing With Sharks - Wayne Lynch
      • California >
        • Jetty, Half Moon Bay, 2/16/14
    • The Price of Existence >
      • Criminalizing Natural Behavior
      • Price of Existence Excerpts with Chris Fallows
      • Dr. Neil Hammerschlag Explains Responsible Drum Lining
      • Price of Existence Trailer
      • Global Opposition to the Cull
      • Daniel Wolfe Interview Exerpt
    • Outtakes >
      • Surfer Interview Outtake
      • Avoiding Gansbaai
      • The Bag Boy
    • Samples
    • Videos from Others >
      • Good Vids >
        • White Shark Research in New Zealand
        • The Shark Man (60 Minutes)
        • Baby White Shark Caught
      • Bad Vids >
        • All that is wrong with Discovery wrapped up in one vid