The roe deer is primarily crepuscular, very quick and graceful, and lives in woods, although it may venture into grasslands and sparse forests. They feed mainly on grass, leaves, berries, and young shoots. They particularly like very young, tender grass with a high moisture content, i.e., grass that has received rain the day before. Roe deer will not generally venture into a field that has had or has livestock (sheep, cattle) in it, because the livestock make the grass unclean. The roe deer is territorial, and while the territories of a male and a female might overlap, other roe deer of the same sex are excluded unless they are the doe's offspring of that year.