Whilst laying, the female needs a lot of nutrition so will leave the nest, sometimes for longer periods of time to feed and rest. Once all her eggs are laid she will rarely leave the nest; unlike osprey, the male does not bring food to the female whilst she incubates. This means that when she does require a short break to feed, toilet and stretch her legs the eggs are left alone. Whilst she is away, the nest is it at risk to predators such as crows, jays, mink, foxes and rats. The female will always cover her nest with vegetation such as leaves and grass to hide the eggs. One of the reasons which mallards lay so many eggs, is because there is a significant chance not all the young will reach maturity. This way there is hope that one or two of her chicks will survive. Mallards will also often lay more than one clutch in a season to increase the chances of their offspring reaching maturity.
The chicks hatch after 23-30 days, and despite being laid separately, they will all hatch around the same time. The chicks are mobile and ready to feed very soon after hatching, they will stay in the nest for just 10 hours to learn how to use their legs. Once ready to leave the nest the female will lead them to the nearby water body.
