I started by spending one day in Jackson, driving up into Grand Teton. The weather was mostly cloudy, with just a few quick swaths of sun. The bison and elk were making their slow march north from near Jackson up into Yellowstone. From where I took this picture, I could see about 100 bison and 50 elk.
When I got over to the boardwalk that goes through the basin, I noticed something out of place, a 400+ pound male grizzly bear. I ran back to the car, grabbed my bag of gear, my tripod, and my camera with the 500mm lens on it.
I started shooting from the boardwalk. This was a BIG grizzly bear. He can run 35 mph and his claws could shred you with ease but he was busy eating the flowers off the dandelions. He would eat a batch and then look around for his next victims. Interestingly enough, each time those victims were closer to the people watching, including me.
Just the same, even with a very long lens, this was the last shot I took before abandoning my camera and getting the hell back. You might be thinking "Steve just cropped this down so it looks close."
During the next few days, I had encounter after encounter with the bison. They are quite certain that the park is theirs and for the most part, they're correct. I followed these guys for about 10 minutes before they decided to head off the road.
Sure enough, I found the nest with the three owlets. They were so tucked in that it was very difficult to see more than one at a time, but I did confirm that there were three. I waited for about an hour, hoping one of the parents would show up. No luck. I got back in the car to go explore other areas.