How soon can anseriform hatchlings swim and forage after leaving the nest?

Anseriform hatchlings are capable of taking to the water and foraging for themselves as soon as they leave the nest, which typically occurs within 24 to 48 hours after hatching.1

Although these young birds are able to forage independently, they remain under the care of at least one parent. The parent provides protection and guidance, and continues to brood the hatchlings at night or during periods of inclement weather.1