The chin is situated near the area where the tongue and jawbone interact during speech. It's possible that the chin provides a surface for the tongue to move against, allowing for more complex sounds and articulations. The development of language is believed to have occurred around the same time as the emergence of Homo sapiens. While other primates have similar facial structures, they don't possess a distinct chin. This suggests that the chin might be related to the unique demands of human language.
Bingo -- other animals don't have a chin because they didn't invent languages like humans did for communication, and thus the demands of speaking weren't evenly distributed.
Next time on interesting questions 104: Why did homo sapiens develop language when other animals such as Corvids did not?
This makes more sense than the need to put on pillow cases (which has been my prevailing theory up to this point), but your question about corvids intrigues me. Partially because I'm not entirely certain of what a corvids is.
Corvids/Corvidae is a species of birds which include crows and ravens - they have demonstrated complex intelligence via tool use and social circles, so they're comparable to human intelligence of some specific various ages/milestones, but didn't invent a spoken language.