Which animals cannot walk backwards? Detailed answer

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Which animals cannot walk backwards? Detailed answer

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Which animals cannot walk backwards?

According to popular belief, kangaroos and emus cannot walk backwards. That is why these animals are depicted on the coat of arms of Australia as a symbol of forward movement, progress.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Why are cranberries and many other berries sour?

Most plants with very acid fruits are spread by birds. Getting to them in the digestive tract, the seeds are subjected to harsh chemical treatment. First, they must pass through the stomach with hydrochloric acid, then through the intestines with an alkaline environment. And all this at temperatures above 40 degrees Celsius!

Acidic pulp, once in the stomach, reduces the production of hydrochloric acid, since the nerves responsible for its secretion react to the general acidity in the stomach. And the acid of the fruit itself is not dangerous for its seeds. When passing into the intestines, the acid neutralizes the alkali, so the seeds have the opportunity to safely avoid digestion and, having passed the intestines of the bird, ascend.

The mammalian digestive system works in the same way, but with the difference that there are less acids and alkalis, the temperature is usually lower and the seeds are more likely to remain intact. Then the increase in the number of sour fruits to the north becomes clear - there are fewer large mammals there, and more birds. Plants with small seeds must adapt to being eaten by birds.

You can, of course, grow a very strong shell that is indigestible. But then the seeds will become large, their number in a small fruit, respectively, will decrease, and the ability of the species to spread will decrease.

In the north of Russia, only large plants with relatively large fruits have hard seeds, mainly trees and shrubs - hawthorn, raspberries, blackberries. But such seeds for the plant are not quite convenient: without processing in the bird's intestines, a dense shell does not allow the seeds to germinate.

This has been proven in an experiment: hawthorn seeds were buried in the ground, protecting them from birds and rodents, and they almost did not sprout. And nearby, self-sowing, which has undergone bird processing, amicably ascended.

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