 Many deer species—including fallow deer—have a social organization which can be tremendously plastic depending on their environment, meaning that group size and habitat type are closely linked to herd size.It is important to note that most of the detailed research on the ecological characteristics and behaviour of fallow deer occur in large blocks of woodland, which means there may be some bias present.Fallow deer can be found in a variety of habitats when can range from cool and wet to hot and dry habitats.