Because of the havoc that might result if an enemy bomb were to fall among buildings housing animals, the keepers and guards at the Bronx zoo occasionally rehearse the duties they will perform in the event of an air raid. Roundup of escaped animals can be accomplished by using a portable canvas wall, but panic may cause some to flee the zoo grounds. To prevent rampaging wild animals from getting away, keepers have been armed with rifles. In a recent drill, the fire fighting squad, always on the alert, dashed to the scene of a theoretical fire on the roof of the elephant house, largely for the purpose of learning how the pachyderms would react. Neither the arrival of the apparatus, loaded with all necessary equipment for fighting fires and incendiary bombs, nor the activity of the firemen setting up a ladder and running a hose to the roof, drew more than a look of utter disinterest from the huge beasts.