Leaf-sheep slugs have the face of a sheep, a body of a leaf, and can photosynthesize

First documented in 1993, leaf-sheep slugs absorb and use plant cells from the algae they eat. They use these cells to get energy from the sun through photosynthesis like a plant. These cells eventually die off but are constantly replaced. 

This process of stealing plant cells for animal use is called kleptoplasty.