Cephalopods such as octopus, squid, and cuttlefish are fierce predators with large brains, complex sensory structures, and rapid locomotion enabled by jet propulsion. They have advanced eyes similar to vertebrates and can change their skin color rapidly using specialized cells. Their highly developed nervous systems and grasping tentacles allow them to both hunt prey and defend themselves as skilled predators in the ocean.

1. Mollusks: Cephalopods Octopus, Squid, Cuttlefish

2. Cephalopods Fierce Predators Large brains Complex sensory structures Rapid locomotion Grasping tentacles Octopus vs . Shark

3. Physical Characteristics Anterior Tentacles and jet propulsion Mantle (Shell) Nautilus: only cephalopod w external shell Fills it with gasses to help w buoyancy Squid: internal shell, helps with structure Octopus: NO SHELL

4. Locomotion Jet like propulsion out of mantle Squid: uses it for catching prey Up to 25 mph! Squid catching cameras. Octopus: escape method

5. Digestion Enzymes digest food in stomach Moves to anus Expelled during jet propulsion

6. Nervous/Sensory System Very large brain Dedicated to movement/control of tentacles Very smart: octopus are known to problem solve Curious Giant Octopus Octopus Opening lid Eyes: advanced, similar to vertebrate eyes Convergent evolution

7. Predator Adaptations Locate prey by sight capture prey w tentacles/ suction cups Tentacles reinforced w protein Eat using a radula Cuttlefish: small invertebrates Octopus: Nocturnal: snails, fish, crustations

8. Predator Adaptations Chromatophores Cells that can change colors Tiny muscles contract or expand and chromatophores quickly change color Alarm response Defensive Blend in w environment Courtship Bioluminescence Cuttlefish in love