There are 1,063 mountain gorillas left in the world. Every one of them has a name, a known territory, and field researchers who have documented them for decades. When you trek into Bwindi, you are not encountering wildlife in the abstract. You are meeting a specific family: the Rushegura group, or Habinyanja, or Oruzogo. The silverback has a name. Your guide knows which trees they slept in the night before.
You leave the lodge before dawn. Your guide reviews the rules: no flash photography, stay seven metres back, leave immediately if you feel unwell. Then you walk. The walk might take thirty minutes or it might take four hours through dense, steep, and very wet forest. When the trackers locate the family, you have one hour with them.
One hour that most guests describe as the most significant experience of their lives.