Changing SeasCoastal Carnivores - Trailer Preview: Season 4 Episode 4 | 1m 53s Scientists studying the coastal Everglades have made some perplexing discoveries. Bull sharks are living upstream where alligators should thrive, and gators are swimming out to the ocean to feed. A coproduction with Symbio Studios. Aired: 06/21/12 Rating: NR Closed CaptioningVideo has closed captioning.checkmarkAdd to WatchlistWatch Full LengthProblems Playing Video?Report a ProblemClosed CaptioningShare:Share this video on FacebookFacebookShare this video on TwitterTwitterShare this video on Google PlusGoogleShare this video via EmailE-mailReport a ProblemBefore you submit an error, please consult our Troubleshooting Guide.Type of ErrorVideo doesn't loadVideo loads, but doesn't playVideo jumps back/forwardOnly audio is streamingSponsorship playback errorOtherPlease add more detailsCancelSubmit ReportYour report has been successfully submitted. Thank you for helping us improve PBS Video.CloseCloseCloseMajor funding for this program was provided by the Batchelor Foundation, encouraging people to preserve and protect America’s underwater resources. Additional funding was provided by Diver’s Direct, inspiring the pursuit of tropical adventure scuba diving.