You do not say where you are from or what time of year you are seeing them...assume October?
They look like one of the dung beetles. Without seeing more angles and a close up of the antenna and tarsi or toes it would be hard to ID any further.
Do you live near livestock?
These beetles feed on dung of various animals or on carrion (dead animals). If it is one of the earth-boring scarab beetles they live in burrows in the ground with the larvae doing most of the feeding on dung or carrion.
Since yours looks like it is rather plain black, smooth dung beetle then it might be one of the tumblebugs which roll the dung or carrion into balls where they feed, eggs are laid for rearing their young.
