There was a bird on a Shuttle when it launched at least once. That bird got the scare of its life. It also almost certainly died. Another pair of birds got hit by a shuttle and fell into the exhaust. So yes there are animals that got scared or died from the launches. That alone isn't reason enough to stop. Also Falcon has a minimal amount of toxic chemicals, at least compared to most launch vehicles. Brownsville isn't ideal, but it's not bad if their purpose is to avoid some of the bureaucracy--they won't get away from it completely, they'll still have to deal with the FAA, more in fact than they do now. Better than Mojave or anything inland by a great deal.