Squid and octopuses belong to the same class called 'molluscs'. However, while studying a squid vs. octopus comparison, it was found that both these animals varied … Squid is the cephalopod aquatic animal that lives in the salty oceans and prefers to live in open water spaces. KONG vs Giant Squid (Mire Squid / Giant Octopus / Kraken) - Fight Scene - Kong: Skull Island (2017) Movie Clip A Face-off Between Squid Vs. Octopus – What’s the Difference? Both are head-footed aquatic animals. The average lifespan of an octopus is 1 to 3 years. Squid vs. Octopus. Octopi normally range from 1cm to 5m in size. Octopus catch their prey with their arms and kill it by injecting venom into their body that paralyzes them.