It all began nine years ago when Mark Glenshaw was walking in the 1,400 acre Forest Park near his home in St. Louis.
He had been doing this regularly for several years but this time out he said he saw two great horned owls in the park. "The first sighting I had set a really high benchmark. Just was instant addiction. In 20-30 minutes I saw them hoot together, duet, a beautiful vocal and visual display. I saw them fly. Powerful, graceful, silent flyers. And then I saw one of them chase a great blue heron, a bird twice its size and I was completely hooked."