Humans and other animals usually share certain features and traits. There are exceptions, such as the Dirt Eater, which don't seem to be related to the rest of the tree of life.
Nedrils are found in many animals. Nedrils are very long tube-like structures which connect the nervous system to sensory organs. They transmit voovites, which are little guys who write down messages on little notepads. Voovites can move and write messages very, very fast.