When we look at earthworms, they may seem similar to snakes, with their bodies appearing as a long tail below the head. This raises an interesting question: could it be that their tails are actually quite short? The anus of an earthworm is located at the very end of its body. According to the standard that "everything below the anus is considered the tail," one could argue that earthworms do not possess a tail at all!
However, it's important to note that earthworms do not require a tail for their movement. They rely on the contraction of muscles throughout their entire body and the coordination of their segments to propel themselves forward. Adding a tail would only serve as a hindrance when they dig through the soil.
Thus, the design of an earthworm's "tail" is simply not to have one, maximizing efficiency in their movement and survival. This unique adaptation allows them to thrive in their environments without unnecessary appendages.
