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The common octopus can hear sounds between 400 Hz and 1000 Hz, and hears best at 600 Hz. [61] Octopuses have an excellent somatosensory system. Their suction cups are equipped with chemoreceptors so they can taste what they touch. Octopus arms move easily because the sensors recognise octopus skin and prevent self-attachment. [62]
Predators of the common blanket octopus include the blue shark, [8] tuna, [9] and the billfish. [9] Female blanket octopuses can roll up and unfurl their webbed blanket as needed. [10] The blanket serves to make the octopus look bigger, and the females can also sever the blanket off to distract predators. [11]
Natural predators of cirrate octopuses include large teleost fish and sharks, and even marine mammals such as sperm whales and seals, but these are mostly predators of other cirrate genera. Grimpoteuthis has only been recorded in the stomach contents of a shark. [14] The Grimpoteuthis do not have an ink sac (as is the case with all cirrate ...
The common octopus (Octopus vulgaris) is a mollusk belonging to the class Cephalopoda. Octopus vulgaris is one of the most studied of all octopus species, and also one of the most intelligent. It ranges from the eastern Atlantic, extends from the Mediterranean Sea and the southern coast of England , to the southern coast of South Africa.
The octopus Thaumoctopus mimicus is known to mimic a number of different venomous organisms it cohabitates with to deter predators. [46] While background matching, a cephalopod changes its appearance to resemble its surroundings, hiding from its predators or concealing itself from prey.
East Pacific red octopus, rescued from a gull near Los Osos, California. Octopus rubescens (commonly the East Pacific red octopus which is a Cephalopod, and also known as the ruby octopus, a preferred common name due to the abundance of octopus species colloquially known as red octopus [1]) is the most commonly occurring shallow-water octopus on much of the North American West Coast and a ...
Higher trophic levels include all predators of octopuses, and may fluctuate with octopus abundance, although many may prey upon a variety of organisms. Protection of other threatened species may affect octopus populations (the sea otter, for example), as they may rely on octopuses for food.
The skin of the octopus is smooth and can change colour slightly to hide from both predators and prey. As a form of self-defense, the octopus can release ink to deter a predator. The eyes of an octopus are considered to be far more developed than those of many other marine species, they are primarily nocturnal and undertake a range of ...