Abstract
Sand and rock provide unique thermal niches in hot deserts. The sand mammal Psammomys obesus is compared with the sand lizard Varanus griseus and the two are further compared with the rock mammal Ctenodactylus vali and the rock lizard Uromastix acanthinurus. The thermal niche breadth of the sand lizard is narrow compared with the rock lizard and the sand mammal. The broad thermal niche of rock offers the possibility of herbivory to the rock lizard. The contrast between the mammals is less marked because they can broaden the thermal niche by being active at low surface temperatures. Niche overlap between the mammals and the lizards indicates that thermal niche separation is not the only factor in permitting their co-existence.
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