The study looked at how European starlings make decisions when choosing between different options, like food sources. The researchers found that the starlings generally made choices that followed basic rational principles, like consistency and stability. They also explored reasons why animals might sometimes make choices that seem irrational, such as changes in their environment or how they perceive rewards. Overall, the study suggests that breaches of rationality in animals may be limited to specific situations, and that preferences can change based on the context.