LATITUDINAL VARIATION IN SEX-RATIOS OF BELTED KINGFISHERS

Data from the Bird Banding: Laboratory and Christmas Bird Counts indic ated that northern populations of Belted Kingfishers (Ceryle alcyon) w ere composed of proportionately more males than southern populations d uring fall and winter. The pattern of male bias in northern population s was also evident in fall/winter census data from an intensive study in Colorado, USA. Bird Banding Laboratory data indicated that the fall /winter trend in sex ratio was not maintained during spring/summer.