Useful websites
http://8e.devbio.com/
http://www.biocourse.com/mhhe/bcc/search.xsp
http://www.intute.ac.uk/healthandlifesciences/bioresearch/
http://www.sdbonline.org/archive/dbcinema/
http://www.msstate.edu/dept/poultry/avianemb.htm
http://chickscope.beckman.uiuc.edu/resources/egg_to_chick/coloring.html
http://www.visualsonics.com/imageatlas/app.php?scid=1&anid=4
http://lancaster.unl.edu/4h/Embryology/candling.shtml
http://staff.um.edu.mt/acus1/FERTILIZATION.htm