Birds, not primates, have the most comparable level of vocal complexity and variability to humans, according to ornithologists. Researchers have utilized large databases of bird calls, such as the one from the Cornell Lab of Ornithology, to learn more about the ways in which birds communicate. Birdsongs are more complex than bird calls, with multiple notes and clear patterns. Some species even have regional dialects and cultural evolution within their songs. Birds also have the ability to mimic other species, including humans and machines. The New York Times is encouraging readers to explore the avian soundscape through birding by ear.
https://www.nytimes.com/interactive/2023/07/21/science/bird-calls-songs-quiz.html