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Caprock Canyons is a state park in the northwest portion of Texas and sort of an extension of the famed Palo Duro Canyon which lies further north. The canyons were home to Native American cultures nearly 10,000 years ago and explored by the Spaniards in the 1500's and 1600's. In the 1800's it was cattle country and farming. It became a state park in 1982. There was an old railroad grade which ran between the towns of Estelline and South Plains over a distance of 64 miles. It travels roughly on the edge of the caprock escarpment and passes through three counties. The railroad was active here until approximately 1985 and then converted to a hiking, biking, horseback trailway. It can be "thru hiked" if one desires. Water is an issue because there are no natural water sources along the trail. There is a tunnel along the trailway that is a summer home to the Mexican free tailed bat and up to a million bats may reside there during that time. I hiked to the tunnel (5 miles one way) and spent the night. I didn't see any bats but I did check out the tunnel. It seemed the bats had not arrived yet.
An ammonia odor was pretty strong at the tunnel entrance. Further in the ground is covered in guano. I didn't walk through the tunnel but it's about 1/4 mile long.
Turn up your volume to max. At the beginning and at 11 seconds you can hear the call of the Bob White Quail. They are masters at hiding. I walked around but couldn't find him.