1. Tracking of Arctic terns Sterna paradisaea reveals longest animal migration
2. Popular Mechanics, "Frigatebird Study", July-7-2016, www.youtube.com/watch?v=-yAMeiiKy-o
3. EdoStuff Aviation, "MD-82 Close-up Takeoff and Awesome Engine Sound", Feb-8-2015, time mark 0: 02 to 1:40. www.youtube.com/watch?v=fin-gp6LzXQ