Answer:
The nosy visitors observed the lions' routine for nearly an hour before moving on.
Explanation:
In this passage, we have a description of an average safari with a lot of tourists trying to capture the perfect photo, no matter what it takes. It is obvious that the lions are not a fan of it, as the people keep mingling around them, staring, making noise, etc, so it is almost like in a zoo. So, the author used the neutral word curious, while nosy, meaning being too much into others` business, is more suitable, but only if we want, like it is said, to create a more negative connotation.