Sights are physical features that can be seen from Pullouts or on Maps & might be a large area (e.g., a mountain, meadow, river or forest) or might be a single object (e.g., a tree or a rock).
You see the Pullouts in Yellowstone SPOTR where that Wolf Pack might be seen.
Information on selected Pullouts in 4 Areas of Yellowstone NP - Northern Tier (Base, Antelope Valley, Swan Lake), Dunraven & Canyon, Hayden Valley & Yellowstone Lake East.
You can select from that list & show which Wolf Pack(s) might be seen from that Pullout for that year.
Some Map Sights can also be seen from Pullouts so the Search result contains both.