The court was also shown footage of animals in poor health living in broken cages.

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Frans de Waal, a primatologist at Emory University, has observed that the size and strength of male chimps is an extremely poor predictor of which animals will dominate the troop.

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Mr Singer's influence extends to the world beyond the ivory tower partly because he writes with such lucidity and quiet passion about genuinely pressing questions: the environment, the rich-poor divide, cruelty to animals, human suffering.

ECONOMIST: Moral arguments: Animals too | The

Dozens of official reports, plans and national strategies, and promises of technical help, have failed to overcome a vicious circle: most herders are poor, have too few animals, and cannot afford the improvements in breeding, pasture management and shearing needed to raise fibre quality and yield.

ECONOMIST: Misguided mercantilism, or self-help

Three months after they arrived, they arrested an illiterate man and woman, both dirt-poor herders living together for years with their animals outside the town of Aguelhok.

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With the animals coming from zoos - some, reportedly, kept in poor conditions - the immediate outlook for the lemurs themselves was clearly positive, as they'd have forest to roam through rather than a cage to stare through.

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