squid

As salt-water bivalve molluscs, oysters live stationary in marine or brackish habitats. They create “oyster reef” ecosystems in which many other animals, from barnacles to mussels, find stability and protection from predators

Squids have evolved complex sensory systems. They are fast, stealthy predators of the seas, but also prey for marine mammals, seabirds, turtles, and a host of fish