TED Talks
Ted: Ted Ed: How Do Dogs See With Their Noses?
You may have heard the expression that dogs 'see with their noses.' But these creature's amazing nasal architecture actually reveals a whole world beyond what we can see. Alexandra Horowitz illustrates how the dog's nose can smell the...
Other
Monell Chemical Senses Center: Areas of Research: Sensation and Perception
Overview of how chemical signals from animals mark territories, identify individuals, signify social rank, and indicate reproductive and health status.
US Department of Agriculture
Agricultural Research Service: Salmonella Uses Chemical to Communicate
This site from the Agricultural Research Service cites a study that has found that Salmonella bacteria release a chemical that directly affects the growth of microorganisms. (January 27, 2000)
PBS
Nh Pbs: Nature Works: Chemical Communication
This site deals with many animals' use of chemical communication or pheromones to communicate. Includes examples and pictures.