Coller foundation press release: https://www.jeremycollerfoundation.org/news-and-insights/pre...

The actual publication in Science: https://www.science.org/doi/10.1126/science.ads8482

> Although the birds occasionally made mistakes, they more often confused calls with similar meanings rather than similar sounds. “Their responses indicated they have a mental imagery of the meaning of their vocalisations,” Elie said. “In other words, that they understand the meaning of their call types.”

    https://www.pnas.org/doi/10.1073/pnas.0908113106

Left this comment as another computer science connection.

>She then applied machine learning to analyse how information was encoded in the calls before testing her findings through behavioural experiments.