The purpose of an octopus siphon is to expel water from its body, allowing it to move quickly and efficiently. The siphon is a muscular tube located on the underside of the octopus, near its head. When the octopus contracts its muscles, water is forced out of the siphon, propelling the animal in the opposite direction. This mechanism helps the octopus escape predators, catch prey, and navigate its environment.
by its siphon
siphon
A siphon is a tube-like structure that helps in the movement of fluids. In octopuses, the siphon is used to expel water forcefully, allowing them to move quickly and escape from predators. The octopus contracts its mantle cavity, forcing water out through the siphon, propelling it in the opposite direction.
octopus
a siphon
Octopus do not have fins. They swim by using their arms and body. If they need to go very fast, they squirt water out of their siphon and use "jet propulsion." Mostly, an octopus will just crawl around on the bottom to get around. Some Octopus do have ear like appendage's with which the use to propel themselves through the water also. They are also refereed to as Dumbo Octopus.
Sounds like you are talking about octopus and squids which are not mammals.
That funnel-shaped opening beneath an octopus's head is called a siphon. The black fluid that it secretes when threatened is actually ink, which the octopus uses as a defense mechanism to create a cloud and confuse predators.
OCTOPUS HAVE A BILATERAL SYMMETRY BECAUSE IF IT IS CUT IN HALF THE OTHER SIDE WILL BE JUST LIKE THE OTHER IT WILL BE LIKE A MIRROR VIEW
An octopus squirts its black ink through a specialized structure called the ink sac, which is located near its digestive system. When the octopus feels threatened, it contracts the muscles around the ink sac, forcing the ink out through a siphon. This ink is composed of melanin and serves as a defense mechanism, creating a cloud that can obscure the octopus's escape. The ink can also irritate predators' eyes, providing the octopus with a chance to flee.
An octopus attacks its prey by rapping its arms around it and squeezing the palp out of it until it can finally rip it apart with its rasor teeth.