The octopus does not have a blind spot. source
The octopus does not have a blind spot.
The retina of the octopus is constructed more logically than the mammalian retina. source
The retina of the octopus is constructed more logically than the mammalian retina.
There are around 300 species of Octopus recognized.
Octopuses are characterized by their eight arms, usually bearing suction cups.
Octopuses have three hearts. Two branchial hearts pump blood through each of the two gills, while the third is a systemic heart that pumps blood through the body. source
Octopuses have three hearts. Two branchial hearts pump blood through each of the two gills, while the third is a systemic heart that pumps blood through the body.
Octopuses are highly intelligent, possibly more so than any other order of invertebrates. source
Octopuses are highly intelligent, possibly more so than any other order of invertebrates.
Young octopuses learn almost no behaviors from their parents, with whom they have very little contact.
The octopus has a highly complex nervous system, only part of which is localized in its brain.
Due to their intelligence, octopuses in some countries are on the list of experimental animals on which surgery may not be performed without anesthesia. source
Due to their intelligence, octopuses in some countries are on the list of experimental animals on which surgery may not be performed without anesthesia.
The octopus's primary defense is to hide or to disguise itself through camouflage and mimicry. source
The octopus's primary defense is to hide or to disguise itself through camouflage and mimicry.
Octopus's defenses include distraction with the use of ink sacs and autotomising limbs. source
Octopus's defenses include distraction with the use of ink sacs and autotomising limbs.
The octopus's camouflage is aided by certain specialized skin cells which can change the apparent color, opacity, and reflectivity of the epidermis. source
The octopus's camouflage is aided by certain specialized skin cells which can change the apparent color, opacity, and reflectivity of the epidermis.
When under attack, some octopuses can perform arm autotomy, in a manner similar to the way skinks and other lizards detach their tails. source
When under attack, some octopuses can perform arm autotomy, in a manner similar to the way skinks and other lizards detach their tails.