A method is provided with respect to animals which are allowed to move in an area (11 31) intended therefore, wherein the area includes at least one grazing paddock (12 32) in which the animals can graze, and which the animals can enter and exit. According to the method the content of grass in the grazing paddock in terms of a total amount of grazing time left is determined. The number of animals in the grazing paddock is monitored by automatically registering each entry to the grazing paddock by an animal and each exit from the grazing paddock by an animal. The total amount of grazing time left in the grazing paddock is updated based on the determined content of grass in the grazing paddocks and the continuously monitored number of animals in the grazing paddock. A point of time when the grazing paddock will run out of grass is predicted based on the repeatedly or continuously updated total amount of grazing time left in the grazing paddock. Finally, an action with respect to the animals is initiated at a point of time which is related to the predicted point of time when the grazing paddock will run out of grass.
