Jonah 3:8

Let man and beast be covered - This was done that every object which they beheld might deepen the impression already made, and cause them to mourn after a godly sort. Virgil tells us that the mourning for the death of Julius Caesar was so general, that the cattle neither ate nor drank: -

Non ulli pastos illis egere diebus

Frigida, Daphni, boves ad flumina: nulla neque amnem

Libavit quadrupes, nec graminis attigit herbam