The word “fascinating” in the title of this article is not an exaggeration. In fact, I think this might be the most interesting — and fascinating — video about deer behavior that I’ve ever seen. (FYI: I’ve been watching deer hunting videos since the mid-1970s.)

Below you’ll see an 11-minute YouTube video hosted by Lindsay Thomas Jr. of the National Deer Association. He explains details from an extensive study conducted by Dr. Daniel Crawford of the Jones Center at Ichauway (Georgia) and the Caesar Kleberg Wildlife Research Institute at Texas A&M-Kingsville.

In simplest terms, Dr. Crawford hoped to answer one question: Which predators do whitetails fear most?

To be honest, I was skeptical about the study as Lindsay began explaining its parameters, but I was hooked when he started showing deer reaction around the trail cams when exposed to various predator sounds. And this was smart: As a control, the study team also played common-for-the-area bird sounds, and as you’ll see, the deer heard the birds but were rarely spooked. In total, Lindsay shows 17 different trail cam video clips from the research.

I won’t play spoiler. All I can say is watch the video, all the way to the end. Like I said before — fascinating!