http://news.nationalgeographic.com/news/2005/01/0104_050104_tsunami_animals.html

http://www.pbs.org/wnet/nature/episodes/can-animals-predict-disaster/listening-to-infrasound/133/

http://www.knowledgerush.com/kr/encyclopedia/Alligator/

http://geology.about.com/od/infrasonics/a/birdsound.htm

http://en.wikipedia.org/wiki/Electric_eel

http://www.thefreelibrary.com/Electric+animals-a0189957014

http://www.electricshock.org/electric-animals.html

http://animals.about.com/cs/zoology/a/aa061801a.htm

http://www.upress.umn.edu/Books/L/lippit_electric.html

http://www.ks.uiuc.edu/Research/magsense/

http://findarticles.com/p/articles/mi_qa4054/is_200506/ai_n14778471/

http://animals.howstuffworks.com/animal-facts/animal-migration4.htm

http://www.abc.net.au/science/k2/trek/4wd/Over57.htm

http://scienceweek.com/2005/sw051014-1.htm

http://en.wikipedia.org/wiki/Homing_pigeon