idea for devlog 4-4(next episode): sound frequency. like so some animals can hear the other and other can't. that should give a greater use for ears cu right now, they are just filler parts that people mostly only use for aesthetic purposes. and it can be in correlation with the scary update and the sex update. like certain animals will use there calls to atract mates but not predators. and predators can use this to trick prey like copying their prey's call like modern crows, ravens, or parrots.