The sounds heard represent salmon in different rivers. The changing sounds allow the listener to visualize how the salmon are migrating. The red and green dots and blue arrow represent change in size with population, something you can hear as well.
This compilation of clips recorded by remote cameras document how effectively Washington wildlife can adapt to civilization by crossing under bridges and using culverts and jumpouts to avoid highway traffic.
Life can be a little scary, especially when you're a fawn trying to navigate a road as a car approaches. Jessie Larson of Bremerton shot this touching footage of the mother's rescue after turning off her car to ease their concern.