I walked over a footbridge of a canal close to my neighborhood. Under the bridge was a long canal used to keep rainwater from flooding the walkways. At times, I would stop on the bridge and look over into the ravine. I would often see turtles climbing on the rocks. Then off they would go, into the shallow water just off the muddy bank.One day, construction workers began cleaning out the canal. They were preparing to tear down the footbridge and expand...