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PHILADELPHIA (CBS) — Your dog or cat may be able to tell time.

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A new study in the journal Nature Neuroscience researched mice learning to run down a hallway to a door.

After six seconds, the door opened and the mouse went in to collect a reward.

Researchers then made the door invisible. The mouse still waited six seconds before running down the track.

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The authors say it’s one of the most convincing experiments to show animals using an internal sense of time.