<P> Livestock destined for sale or slaughter, race horses, and pets are frequently transported . It is important to avoid injury and death of the animal during transportation . </P> <P> The Institute for Laboratory Animal Research of the United States National Research Council has produced guidelines for the transportation of research animals . </P> <P> Wild animals are often transported for display in zoos . Some wild animals offer specific challenges . </P> <P> Elephants are regularly transported for circuses and as working animals but are less regularly transported between zoos . Historically, war elephants were transported from their native countries to battlefields throughout the ancient world . Ptolemy II Philadelphus, in the 3rd century BCE, had ships custom - built for the purpose . </P>

How do they transport animals to the zoo