There’s also no shortage of online videos showing particularly adept birds imitating possibly the world’s most famous robot: R2-D2. But it turns out some species are better equipped to copy the Star Wars droid’s high-pitched beeps and boops than others. For their experiment, the researchers analyzed a total of 115 videos submitted to the citizen science website The Bird Singalong Project. The study analyzed examples where different bird species successfully mimicked both monophonic (single-tone) and multiphonic (multiple-tone) sounds. None of the parrot species analyzed were able to replicate the droid’s multiphonic sounds.