A closer look

Finding a living coelacanth in 1938 was like finding a live T-Rex chilling in your backyard, but the weirdness goes way beyond its age. This 400-million-year-old deep-sea 'living fossil' rocks a bizarre cavity in its snout filled with jelly. Known as the rostral organ, it functions as a highly tuned electroreceptor. This ancient fish literally hunts by reading the faint electrical fields generated by the muscle movements of its prey hiding in the dark.