Abstract
Full-term mallee fowl embryos (3 days before hatch) respond to prolonged chilling by increasing oxygen consumption but are unable to prevent egg temperature from dropping. The increase in oxygen consumption is interpreted as the initiation of autonomic thermoregulatory behavior. The transition from purely ectothermic to endothermic behavior takes 3-5 days, a time similar to other precocial birds. However, in mallee fowl, this process occurs before hatching, while, in the other species, it occurs after hatching.
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