Tarantulas are rarely seen in Zion—they are nocturnal and spend most of their time in underground burrows--but sightings are most common on park roads in late summer and fall, when the males are out cruising for females.
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From the deep canyons to the high plateaus of Zion roams a large, stealthy predator: the mountain lion, or cougar. Mountain lions can be six to nine feet long from nose to tip of tail, weighing 80-180 pounds.
The park enjoys relatively good air quality, but it is upwind of urban and industrial sources of air pollution. Air pollutants blown into the park can harm natural and scenic resources such as soils, surface waters, plants, wildlife, and visibility.
The NPS has advised visitors against swimming or submerging their heads in the affected Zion waterways and warned people not to drink water from anywhere in the park. The watches and warnings extend to popular areas of the park, including The Narrows and Emerald Pools.