I recently learned that salmon find their way back to their birth stream partly by smell: https://www.scientificamerican.com/article/how-do-spawning-fish-naviga

I recently learned that salmon find their way back to their birth stream partly by smell: https://www.scientificamerican.com/article/how-do-spawning-fish-navigate-back/ https://www.scientificamerican.com/article/how-do-spawning-f...