Brad from St Louis on 7/23/2009 8:12:16 AM:
Here are a couple photos I took that are in the FAQ:
http://www.bikekatytrail.com/faq.aspx#wildlife
They are the only venomous snakes I've seen on the trail.
The timber rattler was found on a hot day in late September. He was passive and completely disinterested in my presence. The baby copperhead, on the other hand, was found on a cold morning a few days later and was full of attitude.
Everything else I've seen has been garters, speckled kingsnake, some type of black snakes, and green snakes. The green snakes are hilarious - their coloring makes them stand out on the limestone, but they remain dead still.