Crepuscular is an adjective used to describe wildlife that is primarily active at dawn and dusk. Since a large amount of truly diurnal wildlife has already been killed or has been scared into becoming crepuscular, dawn and dusk are good times to view a large percentage of the wildlife you have a chance of seeing. Nocturnal wildlife might also be reasonably easy to view, if our eyes worked better at night. Spotlighting at night can be a good way to view wildlife. Many areas with wildlife viewing do spotlight for wildlife at night. Many do not because of regulations about disturbing the wildlife. Either way, though this is a good way or even the only way to view many species, the viewing is not as good as having actual daylight.
One more advantage to being crepuscular is the possibility of getting views like this Adirondack sunrise photo taken from our canoe. Believe it or not, this photo was taken with film. The scan does not accurately represent the colors which were even more vibrant than this.