15. Sea Slugs steal to add to their DNA
While Sea Slugs may not stand out as massively evolving beings, they are animals that can show us several ways evolution is proven science. The way they are able to do this is through their absolutely amazing ability to adapt. When food is running short in the cold coastal waters they are native to, they steal DNA from the algae they consume. This allows them to develop genes that allow them to live off of only sunlight, along with the use of chloroplasts.
Their food is literally consumed and they take their DNA like it’s nothing and then pass it on to their offspring! While the next generation of slugs will come with this algae gene, they’ll just need chloroplasts to keep things working. This all happens through something known as Horizontal Gene Transfer, which skates around normal evolutionary traits by up to millions of years. As of now, the Sea Slugs are the only multicellular organisms capable of this… that we know of.