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There is plenty of information on venomous snakes, spiders, scorpions, etc on the web, just search with more specifics, ie: poisonous snakes in Arizona, scorpions in Utah, etc. If you are simply exploring the parks as a tourist, walking the marked trails, visiting overlooks, etc, you need not worry too much about it. Most smaller animals will avoid us same ...
Also, when camping overnight in Yosemite, Sequoia & Kings Canyon you are REQUIRED bear bag for food or even bear can: http://en.wikipedia.org/wiki/Bear-resistant_food_storage_container and having a bear spray might be a good precaution.
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