During its sessile phase, the sea squirt consumes parts of its nervous system that are no longer required.

“But what's interesting about tunicquets is that they live two lives. They have a nervous system. They live two lives. They they are mobile. They swim for part of their life, and then they at some point descend onto a a rock, typically, fix themselves to the rock, and live the rest of their life fixed to that rock. And when they land there, they eventually learn how to harvest nutrients from from the ocean around them, but they eat their own nervous system. They eat their own brain, and they specifically eat they don't really have a brain, but they eat the components of their nervous system that aren't required for moving around anymore.”