Australian Birds

Some other adaptations of Australian birds that can be linked to the unpredictable environment (in turn caused by the ENSO) are nomadism, irregular and seasonal breeding initiated by sudden falls of rain, variations in clutch and multiple broods dependent on the rainfall, precocious breeding, and the habit of older offspring of assisting the breeding male in raising siblings of subsequent broods. All these behavior patterns contribute to an opportunistic life-history strategy. Population increases can be very rapid after drought, just as with the red kangaroo.

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