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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The first animals on Earth may have been sea sponges, study suggests

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To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.