You know what, Yaël, all those TV shows and movies that show dogs rescuing humans must be bogus.

Evolutionary theory tells us that animals are selfish.

They act to spread their own genes by surviving and reproducing.

Don't be too sure about that, Don.

There are lots of circumstances where cooperation and mutual aid can help animals survive and reproduce, and in these circumstances evolution can promote helpful and unselfish behavior.

A study by American researchers published in 2020 shows that domestic dogs really will rescue their owners even when they haven't been trained to do it for a reward.

How did they do that?

The researchers staged an experiment with pet dogs and their human owners.

The experiment involved a large box which the dogs had to open under three different conditions.

In the first case, the dog had to open a box to get food placed inside.