As Dominate Animal, except it can affect multiple targets. The caster may direct the animals en masse or single out specific animals for specific orders. If one animal breaks the spell (because the caster gave a questionable order, or the animal made its save, etc), the spell is not broken for the remaining animals.
This spell is also known as The Holy Word of Krynhoth. The verbal component is a single word, and it was originally obtained by Alax Krynhoth, who finagled with his deity for years before the deity finally granted the spell.