Megapodes: Recent ideas on origins, adaptations and reproduction

Some birds don't incubate their eggs using the warmth of their bodies. The megapodes have evolved a markedly different method of incubation. By making use of environmental heat, adult megapodes are emancipated from most of the usual constraints to reproductive success associated with parental care. Consequences of this unique incubation method are evident in all aspects of megapode development and behaviour. Recently, renewed interest in these birds from a number of disciplines has led to significant advances, especially in aspects associated with reproduction. Both eggs and embryos exhibit remarkable adaptations to the physiologically stressful incubation environment. The use of various types of incubation heat may also shape the mating systems of the species involved.