There is limited shade, so carry water, wear shoes with a firm grip and bring sun protection. The approach is remote and includes unsealed roads, so allow extra time and do not count on nearby services. There are no toilets at the trailhead. Cooler mornings are the most comfortable time for the uphill walk; spring is a good choice if you also want to see flowering native vegetation.
Kangaroos and emus occur in the wider Grampians, but sightings here are incidental. The reason to come is the cultural site itself, not guaranteed wildlife.