They rely on spiny cells to protect themselves, but marine invertebrates have other defenses, such as carapaces, such as spider crabs. These spider crabs spend most of their lives in the deep sea, but 200,000 congregate off the coast of South Australia each year for an expedition to shallow waters.
Spider crabs gather here, not only to molt, but also to mate, and they are full of passion here, seizing the opportunity to reproduce. However, such large-scale gatherings inevitably bring some harm, which can attract predators. This is a stingray, and despite the large number of prey in front of it, this stingray does not seem to care, perhaps fearing the number of prey. However, not all spider crabs rely on colony protection. Alarms spread among crab colonies, and in fact most crabs are safe.
This stingray is very picky, it is only interested in the softest prey of the crab shell, and once it is selected, it is certain to die. Locally, this stingray is known as the man-eating squid. One squid was enough to make the prey fearful, but at this time, a group of squids came, as many as a few hundred.
The Humpheberg squid is a highly intelligent hunter with a special visual system, powerful brachiopods, ring-hooked suction cups and a sharp mouth that tears muscles. At this point, the fish found that the situation was not good, and they gathered to fend off the attackers. However, the Hundberg squid squid sprang into action to drive schools of fish near the rocks.
The squid shines red and white throughout its body, not only to disturb its prey, but also as a signal for a collective attack. Squid swarms come and go quickly, and soon disappear into the deep sea. Red starfish and sea urchins cover the seabed. This worm monster eats almost everything, constantly searching the seabed for food, and they push their stomachs to complete their feeding.
Starfish crush the stomach and secrete digestive juices to break down the seal skin, which is time-consuming, and the scavengers feed on the seal throughout the summer until a skeleton remains. It is no accident that such a large population of jellyfish appears, and they incubate collectively once they encounter the right water temperature and currents.
Plankton blooms in late summer, and the jellyfish colony is just right for a feast. Jellyfish don't have brains or blood, but they have eyespots that distinguish light from dark, and they move through ocean currents by simply propelling. Jellyfish prey on their spiny tentacles, trapping plankton with their tentacles while contracting their bodies and swallowing them in their mouths. A herd of 100,000 jellyfish seems to deter predators.
But this guy is different, it's a giant poached egg jellyfish. It is a jellyfish killer. The weapon of the poached egg jellyfish is a harpoon-shaped tentacle. They shoot their tentacles when they touch their prey and slowly enjoy their prey. A very small number of jellyfish get away with it, and most have only one outcome that is death. Like many marine invertebrates, jellyfish have soft and fragile bodies.