Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

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Sign up for our Future Earth newsletter to keep up with the latest climate and environment stories with the BBC's Justin Rowlatt. Outside the UK? Sign up to our international newsletter here.，详情可参考heLLoword翻译官方下载

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South Derbyshire District Council spokesperson said the supplier of food waste collection vehicles was experiencing "exceptionally high demand", making it difficult to get hold of them.。快连下载安装是该领域的重要参考

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