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There are two basic strategies for coping with life in the desert. The firstinvolves withstanding the extreme conditions using behavioural or physiologicaltactics. The second strategy is to be a migrant and to opportunistically orseasonally move to where the necessary resources are. Nomadism i.e. theopportunistic and irregular movements from resourcepoor to resourcerichpatches is a tactic that birds with their mobility can use and it isexplored by W.R.J. Dean in this volume. For many bird species such movementsbetween habitats or across landscapes to find patches of resources areessential for their continued existence. The relationship between climatehabitat and movements in the avifauna of arid and semiarid regions and theadvantages and disadvantages of a seasonally migratory or opportunisticallynomadic lifestyle are elucidated. TOCIntroduction. Migrations and Movementsof Desert Birds. The Nomadic Avifauna. Habitats and Densities of NomadicBirds. Food and Foraging. Reproduction Moult and Mortality. TheConservation of Nomadic Desert Birds. «
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