More: Rats shown to feel regret over bad decisions (BBC News, 8. June 2014)Rats experience regret when their actions make them miss out on better food options, a study has found.
It is the first time regret has been identified in mammals other than humans.
Researchers created situations where rats had to choose whether to wait a set amount of time for a food reward, or move onto another one.
Those that moved on and found the next offering was even worse showed regretful behaviour.
Another "unique" human trait found to be less unique than some like to think.