The manta ray fish has two strange horns, but how did they appear?
Why does the manta ray have horns - daily science news

The manta ray has two fleshy horns on its head which earned it the name of “devil ray”. The question is how did these horns appear in the evolution of the species?

To investigate this, researchers studied genetic material from the embryos of the cownose rays, a close relative of the “devil”. The results showed that the horns are in fact the foremost bit of fin, which was modified in time, to serve a different purpose.

This confirms a theory popular among evolutionary scientists claiming that novel features, often strange ones, can appear in nature from minor evolutionary twists.

Read the full story: San Francisco State University
Scientific publication: Frontiers in Ecology and Evolution