Changes
generally accepted ... still not proof
The [[salmon]] is a familiar example of an anadromous fish; everyone has seen dramatic images of salmon struggling as they swim upstream to [[spawn]]. Most salmon return to their "home stream," the stream where they were born, to spawn, even though may have traveled thousands of miles away from it as adults.<ref>"... salmon are able to return to the streams where they were born after spending years swimming in the ocean." [http://www.nationalgeographic.com/xpeditions/lessons/09/gk2/migrationsalmon.html National Geographic] </ref> In the 1960s and 70s scientists learned that salmon recognize their home stream by smell.{{fact-science}}
*... most scientists believe that salmon use special magnetic navigation to figure out which way to travel. When they get close to the mouth of the river that leads to the stream where they were born, they begin to smell the stream's special scents. They then "follow their noses" to their home stream. [http://www.nationalgeographic.com/xpeditions/lessons/09/gk2/migrationsalmon.html]
*It now seems to be generally accepted that salmon find their way back to their spawning grounds through their acute sense of smell. Just as each major city of the world has its own set of identifiable odors, each stream apparently has a unique set. [http://www.gi.alaska.edu/ScienceForum/ASF2/278.html]
==References==
