Malleefowl feed on herbs, seeds, flowers, fruit, fungi, tubers and invertebrates (2). They create a nest for breeding, though this is no ordinary nest, for they have developed a highly sophisticated method of temperature control for egg incubation (5). In the autumn, males dig a large hole, which is up to five metres wide, and one metre deep, and during the winter they fill it with twigs and leaves. In spring, when it rains, the vegetation in the nest gets thoroughly soaked. It begins to rot and, like compost, produces heat. The male covers the nest with sand to keep it warm, and when the female lays her eggs on the mound, the male buries them under the sand and vegetation, and leaves them to incubate. Throughout the summer the female may lay up to 35 eggs, one at a time on the nest mound. The male, meanwhile, keeps testing the temperature of the mound by dipping his beak into it. If it is too warm or too cold he opens up the mound or adds more sand and, in this way, is able to keep the nest at a constant temperature of 34 °C. When the chicks hatch, one at a time, they dig their own way out of the mound (5). This may take up 2 - 15 hours, after which they make their way to the protection of low lying vegetation. They receive no parental care; within one hour they are able to run and, after just 24 hours, they can fly. Instinct leads the chick away from the adults' home range to fend for itself (2).