According to the legend, Takemikazuchi-no-Mikoto, the kami from the Kashima Shrine from the Ibaraki Prefecture, was once invited to come to the Kasuga Taisha Shrine from Nara. He then arrived in Nara riding a white deer, and since then the deer became considered messengers of kami, divine and sacred beings.
In the past, the killing of a deer in Nara was punishable by death. Today, the Nara deer are declared "Natural Monument" and about 1200 shika (deer in Japanese, written シカ or 鹿) are roaming freely through the town, to the delight of the visitors feeding them with especially made deer-crackers, shika-senbei 「鹿煎餅」.
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/320s
ISO Sensitivity: ISO 200