They must also be able to communicate telepathically with livestock destined for ritual sacrifice. Pagan rites are complex and it's crucial that animals learn their lines and do exactly as they are instructed. Even the slightest deviation from standard procedure can lead to a faulty communion with the Nameless Lord of No Known Name, whom locals call Mr. Johnson for the sake of brevity.
Most sacrificial animals are fully aware of their fates and tend to mumble or mime their lines to delay the inevitable. It's not death that bothers them so much as being reincarnated as motorway service station employees.