When faced with a potential threat, mice often freeze in place. Moreover, when two animals are together, they typically ...

And the helper mice who were doing this, they were very young, like 2 to 3 months old. So is it just instinct - is it - or is this learned behavior? ZHANG: Generally, like, two, three months for ...

When faced with a potential threat, mice often freeze in place. Moreover, when two animals are together, they typically freeze at the same time, matching each other's periods of immobility.