A bird census in the Imperial Palace for 1969

Abstract

The 5th year result, April 1969-March 1970, of monthly 2 hour bird census in the Imperial Palace, along a same route of 4.1km, is reported. The route includes pond areas with winter duck resort and summer heron colony. Total of monthly recorded species varied from 18 (June) to 31 (April), with average of 23.2. The number of birds recorded were 264-718, av. 439.2. Total number of species so far known from the Palace is 75 of which 48 were recorded in the period with only one addition, Japanese Robin which occurred on migration.
Seasonal fluctuation of the number of Great Tit during the past five years, their flock sizes by month, their winter feeding sites, etc., fruits and seeds eaten by birds, records of dead birds found and short accounts on some species are added.