Braille traces its roots to Napoleon's desire for a communication system that could be utilized in total darkness.
Trees have an underground communication and interaction system driven by fungal networks.
Dolphins can recognize each other and even talk over the phone using distinct calls.
Pigeons have fought in war --- Thirty-two carrier pigeons were awarded medals by the United Kingdom for their service in World Wars I and II.
Woodpeckers have no vocal cords and can’t communicate or even make a sound in any way other than pecking
Bees can affect the electric charge of a flower, which tells other bees that the flower is currently out of nectar.
Prairie dogs have a complex means of communication. It's so advanced that not only do they have different calls depending on the type of predator, but they also make sentences that describe the predator.
Elephants communicate in sound waves below the frequency that humans can hear
Meowing is a behavior that cats developed exclusively to communicate with people.
Lizards communicate by doing push-ups