When animals are courting, they will always inexplicably produce many strange behaviors, such as hermaphrodite , which will release sperm and egg cells at the same time, kangaroo will compete for mating rights through group fights. Different species have a common habit before mating: smell each other's butts.
This kind of action that seems a bit embarrassing to people, is a big hobby for animals. When you arrive in front of your favorite object, can quickly exchange information and judge whether you can mate.
Why do animals crazily smell the other person's butt before mating? Don't they smell bad? In fact, behind the seemingly embarrassing behavior of , there is scientific basis.
Why is it fun to "smell butt"?
From naked to suit and ties, from hand-piggy to French feast.
After millions of years, The evolutionary speed of human beings has left other species apart. even sneered at the behavior of animals smelling their butts, and felt that it was "quite uncivilized".
But this is just from the perspective of humans. For animals, smelling butt is an indispensable communication behavior, just as normal as humans shake hands.
For dogs with sensitive sense of smell, they have dense olfactory nerves , , and olfactory skin and cocomonar organs that capture odor molecules. cocomonar device was proposed by Danish biologist Jacques Bibsey, and is located between the nasal cavity and the upper palate.
He found that animals release rich chemical hormones through the cocomonar organ. As long as you stick out your nose and smell it, will know whether the other party is in estrus, physical health, etc.
In terms of quantity, animals' olfactory cells are also far more than those of humans. If there are about 5 million olfactory cells in the olfactory epithelium in the human nasal cavity, then dogs have at least more than 200 million olfactory cells, and has a total difference of more than 40 times! Therefore, we rely on our eyes to understand things, while dogs smell and smell everywhere, which is far more sensitive than human sense of smell and response.
Animals like to smell butts, and another reason is that their anus has two glands that contain a large amount of pheromone, and one is the acronic gland used by to release odor. The other is sebaceous glands that can make the fur smooth. So we often see cats and dogs enjoy smelling chrysanthemums.
Although dogs are keen on smelling their butts, this smell is really hard to describe. American scientist Dr. George specialized in studying the anal smell of dogs and found that a colorless gas with a rotten smell will be released near anal gland . The composition of is similar to that of trimethylamine . The rotten plants buried deep underground in nature will also emit a similar odor .
The stronger the smell of this rotten gland, it means the stronger the dog's body. and the stench released by the anal glands hide a lot of information. Therefore, when the two dogs meet, it is not that they have any special hobbies, but that they are quickly exchanging information, just like handing over business cards in human business occasions.
Humans may lie when socializing with business cards, but the chemical information secreted by animals' anal glands is 100% true. If male dog smells the scent left by other males, will generally decisively abandon it. The bitch can also determine whether the other person's physical fitness is up to standard by smelling the scent, so as to decide whether he wants to mate together.
are also a kind of creature in nature. and humans are also advanced species, so why don’t they have this useful skill?
Why can’t humans do it?
In fact, during the fetal period, we also grew a sharp vomeronasal organ in the nasal cavity of , but slowly degenerates after birth. Perhaps it is following the principle of organ use, and the use of waste and retreat. humans do not need to use their nose to smell and look for food. The vomeronasal organ loses its function. slowly passivates, and basically degenerates by adulthood.
From the perspective of the distribution of olfactory nerves, the human nasal cavity is not covered with olfactory nerves. only exists in the upper back of the nasal cavity, with an area of about 10 square centimeters , and the rest is covered with dense hair follicles or nose hair. only relies on a pitiful olfactory system, and humans' sniffing ability is naturally far inferior to that of animals.
However, although humans have lost their developed sense of smell, there is no large amount of rich chemical information hidden in the anus. But in fact, humans are just in evolution and transferring into other ways. For example, the body odor or sweat we emit comes from apex sweat glands , , and this breath or sweat also contains our gender, health level, mood index, etc.
So dogs with a sensitive sense of smell can only rely on smelling the breath. can determine whether they are their master and how their owner is in their mood. can even determine whether the host is in menstruation. is just this "superpower" and may not be blessed to enjoy it.
In fact, in addition to smelling butts, there are more unexpected and strange mating behaviors in the animal world.
Count the strange behaviors in the animal world
Not only does humans need to give a dowry when they get married, but there is also a dowry in the animal world. Because some organisms lay fewer eggs at one time, they have to be extra careful when choosing males to mating. In order to get favor, males usually bring good hunting food. On the one hand, it improves its success rate, and on the other hand, it also ensures that females reduce foraging costs during pregnancy and delivery. , such as beetle , cricket , obviously have such behaviors.
But some male animals are not so honest. Sometimes they can't find food and will cunningly adopt the deception strategy of "bewitching sexual dowry". packs an empty shell with a gorgeous appearance to the other party. deceives the female's favor and heart to win the opportunity to mating and reproduction with the female. When a female finds that she has been cheated, often stops mating immediately, but it is often too late. A typical creature that acts like
is the strange thief spider. During the mating season, male strange spider will think of many tricks to please the "Spider", so found a bunch of unnutritional plant rhizomes and "packaged" tightly, and even the other party took a lot of effort to open it. Among the cunning spider groups such as
, 30% of the males in have had similar behaviors, trying to deceive the other party's favor, and obtains mating qualifications.
In addition to "fake bride gift", also has a kind of spider that will eat the first male to court before mating. This is the funnel web spider, named after the woven web shape resembles a funnel. Female funnel web spiders usually swallow the first weak male to court, to ensure sufficient physical strength during mating and breeding, and to feed their own young spiders.
Also has the habit of "eating a partner" there are more well-known mantis. However, female mantis usually eat their husbands after mating. is also to obtain sufficient nutrition, because the mating process of has consumed a lot of its energy. If does not eat the other party in time, it is likely that one corpse and two lives will be killed due to insufficient nutrition.
The petite mongoose will adopt a tough and rough way. Once they lock the female they like, they will get started directly. until the female mongoose is not as powerful as fighting back, will quickly start mating. , and this is a very common phenomenon among the mongoose clan.
The last mating behavior that is more cruel than the above is the African batworm. When this type of creature mating, will directly poke the female's epidermis with a spike, and then inject sperm into the pierced wound like an injection. , but a large part of the ban on emission will be killed by the female's immune system, and only a small part can be successfully fertilized.
Such a fast, accurate and ruthless way, allows male African batworms to mated dozens of times a day. Once successfully mated, he patted his butt and left, looking for the next target. But this true image of "unfaithful man" can ensure that African batworms maintain an extremely high fertility rate in the cruel nature of .
All instincts of animals originate from survival, and and mating and reproduction are the only way to ensure the survival of species. In order to achieve the purpose of mating in the animal world, is indeed exhausting its power and using any means!
If humans do not have smart brains and high technology, may not be able to win steadily in this fierce species war.
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