SEXUAL AND ANNUAL DIFFERENCES IN ACTIVITY BUDGETS OF MANED DUCK CHENONETTA-JUBATA

Maned Ducks fed for between 28% (males) and 32% (females) of the day in summer, and 56% (males) and 64% (females) in autumn. Females always fed more than males but males were more alert. Flock size and vigilance, as well as feeding and resting times, were inversely related in both sexes. I suggest that females fed more than males and males were more alert than females, to allow females to maintain body condition during the year. Females in better condition prior to breeding would build up fat reserves for laying and incubation more quickly, providing reproductive advantages to both pair members.