IUCN Red List

Data Deficient (DD)

Species nobody has been able to count properly. Common in the deep sea, where surveying is expensive and rare.

4 species

An Amazon giant that can reach three meters, breathes air through a lung-like swim bladder, and wears scale armor that resists piranhas.

Bottom-walking cephalopod that sends color waves across its skin and flashes warning colors to advertise its venom.

Matrilineal pod dialects, cooperative wave-washing tactics, and apex oceanic dominance.

The world's smallest armadillo, an Argentine sand-burrower wearing a shell of bony plates and hardened scales.

Conservation categories are from the IUCN Red List of Threatened Species. AnimalTracks is independent of IUCN.