GENERAL HISTOLOGY

Detailed explanation-1: -In particular, the Coleoidea subclass (cuttlefish, squid, and octopuses) is thought to be the most intelligent invertebrates and an important example of advanced cognitive evolution in animals, though nautilus intelligence is also a subject of growing interest among zoologists.

Detailed explanation-2: -It’s that forward planning–and use of tools–that surprisingly makes the veined octopus one of the smartest animals on Earth.

Detailed explanation-3: -Octopuses have demonstrated intelligence in a number of ways, says Jon. ‘In experiments they’ve solved mazes and completed tricky tasks to get food rewards. They’re also adept at getting themselves in and out of containers.

Detailed explanation-4: -The octopus is believed to be the most intelligent of all invertebrates. As well as its relatively large brain, each of the octopus’ eight arms has its own rudimentary intelligence. This allows the arms to function independently.

Detailed explanation-5: -Cuttlefish are not actually fish. Rather, they are small mollusks, like squids and octopuses. WIth one of the largest brain-to-body-size ratio, these green-blooded sea animals with three hearts are the most intelligent of invertebrates.