Many species indicate the results of human interaction and environmental changes.
Birds are capable of traveling incredible distances in their migratory movements. For example, the Black Poll Warbler flies 2,550 miles non-stop in 4 days and nights. Wetlands play an important role in replenishing the incredible energy reserves that birds need to complete their journey. In human terms, these birds often find filthy rest stops, empty gas stations, and motels with no vacancy signs. It is very important that students propose the questions to investigate causes and possible solutions to the population decline.