11.   Wildlife wardens, armed with noisemakers, tranquilizer guns and baited bear traps on wheels, patrol a polar bear exclusion zone.

12.   Authorities used a tranquilizer gun to capture the chimps, who were to remained quarantined, the park officials said.

13.   Because there was no tranquilizer gun available, the bear was shot and killed.

14.   Finally, the team resorted to tranquilizer guns on one elephant.

15.   He was more concerned about the use of the tranquilizer guns, which are normally used on elephants and tigers.

16.   Hippos cannot be captured with tranquilizer guns, because they might run into the water after being shot, fall asleep and drown.

17.   Hippos cannot be captured with tranquilizer guns, because they might run into the water, fall asleep and drown.

18.   Hippos cannot be captured with tranquilizer guns, because of fears they might run into the water after being shot, fall asleep and drown.

19.   It took two hours to chase and round up the chimpanzees, who were caught with the help of a tranquilizer gun.

20.   It took two hours to chase and round up the chimpanzees, who were caught with the help of a tranquilizer gun, the park officials said.