Females of what animals can delay the birth of a cub in anticipation of better conditions? Detailed answer

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Females of what animals can delay the birth of a cub in anticipation of better conditions? Detailed answer

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What animal females can delay the birth of a cub in anticipation of better conditions?

Female large red kangaroos can mate at any time of the year and are usually constantly pregnant. However, they have the ability to delay the birth of a young while another newborn is still growing in the pouch and cannot leave it. Usually they resort to such a freezing of embryo development under adverse external conditions, such as drought. Also, females of this species of kangaroo can simultaneously produce milk of different fat content for cubs of different ages.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Where is the driest place on earth?

In Antarctica. Some areas of this continent have not seen rain for two million years.

It is widely believed that the driest place is the high-mountainous Atacama Desert in Chile, while it cannot be called a hot place - in summer the temperature there rarely rises above 17-18 degrees Celsius.

Technically, a desert is a place where less than 254 mm of precipitation falls per year.

In the Sahara, for example, they fall only 25 mm. The average annual rainfall in Antarctica is about the same, but 2% of the entire continent, known as the Dry Valleys, is completely free of ice and snow, and it never rains at all.

The next driest place on Earth is the Atacama Desert in Chile. In some parts of it, rain has not been recorded for 400 years, and the average annual rainfall is a tiny figure of 0,1 mm. Such miserable indicators make the Atacama the second driest desert in the world - 250 times drier than the Sahara.

However, Antarctica is not only the driest place on the planet. At the same time, the mainland claims to be the wettest and windiest. It is there, in the form of ice, that 70% of the world's water reserves are located, and the winds reach speeds that beat all world records.

The unique natural conditions in the Dry Valleys region are caused by the so-called katabatic winds (from the Greek word meaning "down blowing"). They occur when cold, dense air descends down a hillside solely under the influence of gravity. Such winds can reach speeds of 320 km / h, completely evaporating the moisture encountered on the way - water, ice, snow.

And although Antarctica, in general, is a desert, its driest parts, somewhat ironically, are called oases. They are so close to the natural conditions of Mars that NASA is testing the Viking landers there.

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