Even if you've never seen a loon, you've heard its call. Hollywood uses it over and over until you can easily recognize it from film to film, whether you know the bird's name or not. The sound is so ubiquitous that we have come to associate it with nature, the outdoors, or wilderness when a movie is trying to set the scene. But it drives birders nuts.
See, the loon lives in Canada during the summer, and along the US-Mexico border in winter. Yet if you watch enough movies, you'll think "that bird" belongs everywhere, even on other planets. Vox explains why Hollywood is so obsessed with the call of the loon.