Adam Clarke on Mark 1:13

With the wild beasts - This is a curious circumstance, which is mentioned by none of the other evangelists; and seems to intimate that he was in the most remote, unfrequented, and savage part of the desert; which, together with the diabolic influence, tended to render the whole scene the more horrid. Perhaps this very circumstance is mentioned, as emblematical of that savage and brutal cruelty with which he was persecuted to death by the Jews and Gentiles, instigated thereto by the malice of Satan.