Who's smarter, cats or dogs? Science has found a clear winner.

The study also discovered a downside to having a big brain.

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Ever wonder about the intelligence of various animals and how they measure up? Researchers at Vanderbilt University decided to find out. Specifically, they chose a subsection of mammals called carnivorans. This group has 250 species, each with sharp teeth and claws, which allow them to hunt other animals.

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