According to foreign media reports on the 22nd, recently, on the west coast of Australia, researchers installed a "smart tag" on the back of the turtle and took a picture of it actively repelling the tiger shark from the perspective of the turtle.
The video shows turtles attacking in the face of massive predators, trying to bite tiger sharks to protect themselves.
In the face of the turtle's sudden attack, the tiger shark lost the battle and quickly swam away. One expert said the footage was so rare that researchers might have overlooked this aggressive anti-predator behavior in the past.
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Ocean Cold Knowledge| The Sex of Sea Turtles Is Determined by Temperature? Sharks don't eat people?
The ocean is a wonderful world, there are too many unknowns and incredibles: penguins are the love masters of the ocean, the sex of turtles is determined by temperature, sharks do not eat people, jellyfish do not have hearts...
Interesting cold knowledge about marine life, let's take a look.
Penguins are the masters of love in the ocean
Penguins are very dedicated animals, they spend their lives looking for their other half, and once found, there is no room for other penguins in their eyes. In penguin colonies, if two penguins are identified as mates, they remain unchanged for life, that is, monogamy in the animal kingdom. If one of the spouses dies for any reason, the surviving person does not seek a new spouse.
In the budding period of love, the male penguin will send the female penguin a smooth small stone as a promise of love, and if the female penguin agrees to the relationship, she will move the stone back home. If the courtship is successful, the two penguins will often go in and out of pairs.
The sex of the turtle is determined by temperature
The sex of most species is determined at the time of fertilization, while the sex of turtles and crocodiles is after fertilization, and the temperature of the eggs determines whether their offspring are female or male.
If the turtle eggs hatch below 27.7 degrees Celsius, the hatching is the male sea turtle, if the turtle eggs hatch above 31 degrees Celsius, the hatching is the female sea turtle, and the small turtle hatched at this temperature temperature may be female or male.
Sponges are animals
Speaking of sponges, I believe that many people's first impression is its liquid-absorbing properties. But in reality, sponges are an animal. There are many holes in the surface of the sponge, and the water flow can enter its body through the cavity with food, and then there are collar cells in it to feed.
The shape of the sponge is mainly blocky, branched, draped, and umbrella-shaped, and there are also some structures that resemble a barrel. Individual sponges may be only millimeters, while individual sponges can reach two to three meters. It has a very long lifespan, with some species in the deep sea said to have a lifespan of thousands of years.
Sharks don't eat people
There are more than three hundred species of sharks in the world, they generally do not eat people, began to evolve hundreds of millions of years ago, humans are not in their recipes.
Most sharks eat smaller fish or invertebrates than they do, some larger sharks eat seals and sea lions and other mammals, and only 12 of the more than three hundred sharks have attacked humans!
Jellyfish do not have a heart
Jellyfish is an invertebrate, most jellyfish are not yet the size of a human palm, smaller peach blossom jellyfish is only as large as a small glass ball, but jellyfish is a creature that has lived on Earth for nearly 600 million years, and has already evolved many species, so jellyfish also have some large sizes, such as Kasumi jellyfish. One species in the family Kasumi jellyfish is called the "lion's mane jellyfish", which is considered to be the largest jellyfish in the world, this jellyfish has an umbrella-shaped body, with a diameter of up to 1.5-2.5 meters at the top, the size of a small car.
Biologists have found that jellyfish are actually animals with very simple physiological structures, they have no brain, no heart, no eyes, ears, nose and other organs related to vision, hearing, smell, and so on. So how do they feel about the outside world in the water? In fact, they perceive the outside world by the radio waves and magnetic fields emitted by their antennae.
Sea urchins are pests
Sea urchins are echinoderms belonging to the same phylum as starfish, sea cucumbers, snake tails and sea lilies. Sea urchins eat a very wide range of things. Carnivorous sea urchins will feed on worms, molluscs, or other echinoderms on the ocean floor. The main food of herbivorous sea urchins is algae, various seaweeds, etc. In addition, organic debris, animal carcasses, etc., are also their food. As a result, carnivores destroy corals on coral reefs, while herbivores primarily destroy algae and other vegetation that attach to coral reefs. Without the attachment of algae, rocks are more susceptible to erosion by tides and winds. In addition, the damage caused by sea urchins to seagrass is enormous. They eat too much seagrass, leading to vast expanses of barren ocean worlds.
Male hippocampus gives birth to babies
The hippocampus, the only animal on Earth that has offspring from males. Male hippocampus has a brooding sac on the abdomen, directly in front of or laterally. During mating, the female hippocampus releases the eggs into the broodstock sac, and the male is responsible for fertilizing the eggs. Male seahorses keep fertilized eggs in the broodstock sac until they develop and form, and then release them into the seawater.
Starfish are not fish
Starfish do not have the gills and scales of fish, they are not fish, they just live in the ocean, using seawater to replenish nutrients. Starfish move with those small tube feet at the bottom of their bodies. Sunflower starfish can move at an astonishing speed of 15,000 small tubes enough to 1 m/min, and these small tubes can help starfish catch prey.
Starfish are associated with sea urchins, sea cucumbers, and all echinoderms because they all have a five-point radiative symmetry. However, this does not mean that all starfish have five "wrists", some have 10, 20 or even more wrists! If a wrist is broken, starfish have amazing abilities and can regenerate one out.
(Original title: Turtles face sharks coming and even take the initiative to bite each other desperately, sharks lose and swim away)
Source: Synthesized from @ Haike News, Xinhuanet client
Process Editor: TF016