The eyes have it
Eyes reveal which type of juvenile octopus you’re looking at: red or giant Pacific. Red octopuses have three tiny flaps, or “eyelashes,” below each eye; giant Pacific octopuses do not. The flaps are called papillae.
All in the family
Despite their difference in size at maturity, there are many similarities between red and giant Pacific octopuses. Both species are terminal spawners, which means both the male and female die after mating. And all octopuses have three hearts: one main, central heart and two others near the gills. Octopuses are also noted for being the smartest known invertebrates (animals without backbones). They are smart enough to solve puzzles, such as how to get food out of a sealed jar, and have demonstrated an incredible ability to learn complex tasks and improve their performance with repetition.