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.

· · 来源:dev资讯

花有品,人有格。从古至今,这朵淡黄小花被赋予了别样魅力,逐渐成为“不畏严寒,风骨高洁”的象征。

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