 Breeding coincides with the availability of water . In South America and South Africa , the main nesting period is December – February , in Nigeria it is July – December , and in North America mid @-@ May – August . In India , the breeding season is from June to October but peaking in July and August . Fulvous whistling ducks show lifelong monogamy , although the courtship display is limited to some mutual head @-@ dipping before mating and a short dance after copulation in which the birds raise their bodies side @-@ by @-@ side while treading water . 
