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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A tanker at a Karco gas station in Kennett Square, Pennsylvania, US.Photographer: Matthew Hatcher/Bloomberg

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Additional reporting by Usman Zahid and Mahfouz Zubaide