Whoever thought the eel was this smart?:
Researchers working in the Amazon filmed eels gathering in packs to herd prey, then stunning them with a synchronised electric shock.
“It was really amazing – we thought these were solitary animals,” said researcher Carlos David de Santana.
The discovery is published in the journal Ecology and Evolution.Victoria Gill, “Electric eels work together to zap prey” at BBC News
The paper is open access.
Maybe it’s not the eel, who remains stupid about everything else. It is intelligence in nature. Wallace was right.