As far as I know, the Reid Park Zoo doesn't practice animal escapes using people in adorable costumes, but they should.
From Pink Tentacle:
Yesterday's dramatic simulation involved a Siberian tiger that escaped its pen following an earthquake. The mock animal wandered freely through the park, attacking zoo workers and visitors before it was surrounded with nets, shot with a tranquilizer dart, and transported back to its cage.
Theatrical exercises involving people in animal costumes are conducted each year in Tokyo at either Tama Zoo or Ueno Zoo. In addition to providing hands-on experience with capturing escaped animals, the drills force zookeepers to administer first aid, usher visitors to safety, and coordinate with local emergency services.
Also, people do not seem prepared for the two guys in the rhino suit: