The following basic traits of the Proto-Indo-Europeans and their environment are widely agreed-upon but still hypothetical due to their reconstructed nature : The Proto-Indo-Europeans had a patrilineal society , relying largely on agriculture , but partly on animal husbandry , notably of cattle and sheep .
The Proto-Indo-European culture had some or all of these features : The Proto-Indo-Europeans were a patrilineal society , probably half-nomadic , relying on animal husbandry , notably of cattle and sheep .