Devil face crabs have vivid colors but behind that eye-catching appearance they are really scary assassins. This crab species is found in the waters from Da Nang to Vung Tau.
Scientists at the Center for Fisheries Research at the University of California found that high levels of carbon dioxide in the air have made crabs bigger, faster and harder.
A predatory otter has bumped into a row of sea crabs and nearly gets used by the crab to lose its right eye.
The exciting moment when the cuttlefish changes its skin color to hypnotize the prey into the camera lens of Blue Planet II filmmakers.