Men were irrational creatures; why not birds too?

Since he had worked closely with a trustee human, the robot had developed enhanced flexibilities in order to deal with the irrational creatures.

But have we evolved into fundamentally rational or fundamentally irrational creatures?

Or would we prefer continually to be in the right in the way irrational creatures are?

However, this device appears to have been designed by creatures nearly as irrational as you.

Some instinct starved in us, which we try to soothe by treating irrational creatures almost as if they were rational, is really satisfied in Malacandra.

We ought to show equal concern for each individual's good, to acknowledge that human beings are not only rational creations but irrational, emotional creatures.

Because she is an irrational creature, we expound her hypocrisy to her.

"Shareholders are more irrational creatures than we thought," he said.

For choice is not common to irrational creatures as well, but appetite and anger are.