Photosynthetic Slug

Along the eastern seaboard of our fine United States
There lives a slug who slurps algae for hunger to abate
“Not too unusual”, you say when hearing with a glance
Until you realize its evolutionary stance
For not like us they take their food and put it in their gut
They strip away the chloroplast and leave them living up
and let the organelles survive and get hit with the sun
to make them food long after the algea’s carbon is gone
You feed them with some algae for a fortnight then you wait
An entire year they will live on with no food, not a taste!
But before you think that would be cool for us this trait to share
to meet our needs we’d have to be 100 meters squared!