A Theory,

 that is growing in popularity,

is that birds evolved from dinosaurs, I was reminded of this clip from Jurassic Park 2, when one of the actors was chased by a group of raptors or if they were on they way to becoming birds, flock of small dinosaurs,

when I saw this jogger being shadowed by a group of what looked like small raptor dinosaurs, but were in fact a flock of birds, looking at the video it kind of takes the fun out of being on a pheasant shoot.