Paradise being such as it was, it was, naturally, not necessary for Adam to work the land. True, the Lord God put the man into the Garden of Eden to dress it and to keep it, but that only means he is to study the Torah there and fulfil the commandments of God. There were especially six commandments which every human being is expected to heed: man should not worship idols; nor blaspheme God; nor commit murder, nor incest, nor theft and robbery; and all generations have the duty of instituting measures of law and order.
One more such command there was, but it was a temporary injunction. Adam was to eat only the green things of the field. But the prohibition against the use of animals for food was revoked in Noah's time, after the deluge. Nevertheless, Adam was not cut off from the enjoyment of meat dishes.
Though he was not permitted to slaughter animals for the appeasing of his appetite, the angels brought him meat and wine, serving him like attendants. And as the angels ministered to his wants, so also the animals. They were wholly under his dominion, and their food they took out of his hand and out of Eve's. In all respects, the animal world had a different relation to Adam from their relation to his descendants.
Not only did they know the language of man, but they respected the image of God, and they feared the first human couple, all of which changed into the opposite after the fall of man.