The rooster does not crow Sunrise Not only that, it repeats throughout the day. Take a break from shouting Only at night, the howling starts again at sunrise. For this reason, the rooster crow is associated with sunrise and the beginning of a new day. But does a rooster crow at sunrise? A previous study, the results of which were published on the German SWR TV website, revealed surprising results.
A long-standing belief is that roosters start crowing when they see the first rays of sunlight. But it seems the rooster doesn't need the sun at all. He often starts screaming before dusk, before the first rays of the sun appear. In a 2013 study by Japanese scientists, they observed the behavior of several roosters. Some of these have been exposed RoostersIn constant dim light, she can no longer objectively determine the time of day. However, they continued to do so for weeks, starting with a casual early morning rant. This indicates that the rooster follows its biological clock.
A French rooster wins a court case against his human neighbor
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Lots of yelling during the day!
As humans relate Biological clock Roosters obey the constant patterns of nature, including daylight, but do not need light as a signal to start crowing every morning. However, light generally has a certain effect on it. He noticed researchers Only then can you change the lighting levels, sometimes brighter and other times darker. Rooster crows frequently during bright light.
Researchers have also found that hearing another rooster crow can encourage one rooster to crow. This is what is observed early in the morning In rural areas, when one rooster starts crowing, another soon follows, and so on. All of this works through the rooster's biological clock.
In pictures: Animals that reproduce themselves without sex
Only the female (without male fertilization) can reproduce. Some may think this is a fantasy, but scientists have proven this scientific fact in a group of animals. We introduce it to you in this photo tour.
Image from: Image Alliance/dpa/Kitchin and Hurst
Having children means finding a suitable partner first, but finding this can take a very long time. Few animals have been able to completely abandon the long search process of finding a “suitable partner”. Because its reproduction is asexual, and it clones itself.
Image from: picture-alliance/dpa
The marble crab is a parthenogenetic crab and an example of an animal that clones itself. According to recently concluded studies by German researchers, all of these types of cancer are female and are cloning themselves.
Image from: picture-alliance/dpa/R.Andrian
Until now, it was not fully understood how the marble crab lost its sexual reproduction. But genetic analyzes show that it is a descendant of a species of lobster found in North America. Scientists believe that a mutation occurred in one of the crabs in the 1990s, causing its reproduction to become asexual.
Image from: Picture Alliance/dpa/C. Hooter
What distinguishes asexual reproduction is that one female is enough to reproduce an entire species. The “virgin gecko” is one of the animals that relies on self-cloning for its reproduction. They live on completely isolated islands in the Pacific Ocean.
Binary rotifers are microscopic aquatic animals. About 40 million years ago, these animals reproduced asexually. It is true that the environmental conditions on earth have undergone many changes. However, this type of animal survives probably because it has genes from other organisms such as bacteria or fungi in its DNA.
Marble crabs, dioecious rotifers, etc. are all sexually reproducing animals. But there are animals that teach sexual reproduction. The rainbow lizard is an example of these animals. This lizard lives in Central and South America. Some members of the species reproduce asexually, while others reproduce asexually.
Image from: Image Alliance/dpa/Kitchin and Hurst
Asexual reproduction rates decrease in animals that live in groups. But at London Zoo, a virgin Commodore dragon gave birth to four cubs in 2006. It is clearly not a clone. Rather, it is reproduction without male fertilization. Newborn babies have the same genetic material as their mothers.
Image from imago/blickwinkle/mcphoto/I. Schulz
Even sharks have cases of asexual reproduction. In 2007, a shark in the US gave birth to a male infertile baby. Notably, there are cases of self-cloning in the bamboo shark and zebra shark species.
Image from: Image Alliance/dpa/Photoshot
Until now, scientists had not observed the birth of mammals through self-cloning. Scientists believe this is due to the complexity of the mechanisms behind embryo formation in mammals. Which is an advantage. Through sexual reproduction, the risk of harmful mutations is reduced.
