Which birds have learned to protect themselves from cuckoos with a password trill? Detailed answer

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Which birds have learned to protect themselves from cuckoos with a password trill? Detailed answer

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Which birds have learned to protect themselves from cuckoos with a password trill?

Australian painted malura birds have developed a defense mechanism against cuckoos. Even above the clutch, they teach future chicks a unique trill, a kind of password, which the chicks then reproduce in order to get food. But other people's chicks, which were thrown by cuckoos, do not have time to learn the trill, as they hatch a few days earlier. However, if one species of cuckoos parasitizing on malyars is completely vulnerable to such protection, then another species has developed response measures in the course of mutual evolution: in most cases, the chicks of this species successfully select the desired trill after several attempts and also get food.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Why are the keys on the keyboard arranged in the QWERTY sequence?

On the first American typewriters, the keys were usually arranged alphabetically. Due to the imperfection of the design, pressing adjacent keys often led to pinching and typing errors, which, moreover, remained unnoticed by the operator until the carriage was moved to the next line. Therefore, designers began to experiment with spacing frequently occurring letter combinations into different parts of the keyboard in order to increase the productivity of operators. In 1878, the QWERTY layout finally took shape, placed on the Remington No. 2 machine, and has survived to this day in an almost unchanged form.

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Written on nails 11.07.2006

The ancient Romans used the following trick to convey secret messages: they shaved the head of a slave, wrote a text on the skin and allowed the hair to grow, after which the slave was sent to the addressee. Since Roman slaves did not have the habit of washing their hair, the recipient again shaved the secret bearer (who himself did not know the contents of the letter) and read what was written.

Something similar is offered by Japanese physicists from the University of Togushima Island. They record with a pulsed laser up to 800 kilobytes of information (this is the volume of a brochure of 150 pages) on a human nail, filling the nail with dots with a diameter of 3 micrometers with intervals between rows of dots of 1 micrometers. The inscription is almost invisible, especially if you cover the nail with varnish.

To read, the varnish must be washed off and put your finger under a fluorescent microscope.

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