Dike-breaking muskrats in Poland, rabbits that starved out sheep in Australia, the now-famous DDT-induced chain of events that transpired The Day They Parachuted Cats Into Borneo (see Pomerantz, above): all are sobering examples of the unexpected and often disastrous upsets that occur when men interfere with the natural environment. There are more ecological mishaps here, some of them diverting, all of them to the point. The message is clear and today's children are in a mood to listen.