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Top row photos (left to right) from: http://www.esu.edu/~milewski/intro_biol_two/lab__13_echinoderm/images/sand_dollar.jpg,
http://www.animalpictures123.org/wp-content/uploads/2012/05/Lovely-Sea-Urchin-Shell.jpg,
http://www.mote.org/clientuploads/Aquarium/seahorse01.png,
http://i.telegraph.co.uk/multimedia/archive/01480/Portuguese-Man-of-_1480156c.jpg
Bottom row photos (left to right) from: http://www.seaotter.com/marine/research/neoesperiopsis/rigida/pics/rigida.jpg,http://www.statesymbolsusa.org/IMAGES/Louisiana/brown-pelican-nps.jpg,
http://www.allaboutbirds.org/guide/PHOTO/LARGE/laughing_gull_breeding_adult_ian_davies3.jpg,
http://www.groupfortheeastend.org/wp/wp-content/uploads/2013/04/horseshoecrab.jpg
http://www.animalpictures123.org/wp-content/uploads/2012/05/Lovely-Sea-Urchin-Shell.jpg,
http://www.mote.org/clientuploads/Aquarium/seahorse01.png,
http://i.telegraph.co.uk/multimedia/archive/01480/Portuguese-Man-of-_1480156c.jpg
Bottom row photos (left to right) from: http://www.seaotter.com/marine/research/neoesperiopsis/rigida/pics/rigida.jpg,http://www.statesymbolsusa.org/IMAGES/Louisiana/brown-pelican-nps.jpg,
http://www.allaboutbirds.org/guide/PHOTO/LARGE/laughing_gull_breeding_adult_ian_davies3.jpg,
http://www.groupfortheeastend.org/wp/wp-content/uploads/2013/04/horseshoecrab.jpg