Black ghost knifefish, Apteronotus albifrons, swimming. They live on freshwater habitats in South America from Venezuela to Paraguay, including Amazon

- Image ID: MW13PN

Black ghost knifefish, Apteronotus albifrons, swimming. They live on freshwater habitats in South America from Venezuela to Paraguay, including Amazon

Paulo Oliveira / Alamy Stock Photo

Image ID: MW13PN