Bibliography

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http://www.sanctuaries.nos.noaa.gov/pgallery/pgstellwagen/habitats/habitats_1.html

http://www.dfg.ca.gov/mrd/mspc004.jpg

http://www.boattalk.com/sharks/thresher.htm

http://www.factmonster.com/spot/sharks2.html

http://www.enchantedlearning.com/subjects/sharks/classroom/sharktemplates/Thresherprintout.shtml