Relationship between the visiting birds and nectar secretion in the cherry tree.

The flying birds to cherry tree, Prunus campanulata, are well known. However since their relationship has not yet been examined, then the present study elucidated their relationship at Tama Forestry and Forest Product Research Institute. The observation of flying birds was carried out on their species, number, attitude and visiting time, with naked eye, a video camera, and a camera from the blind.