The deeper roar of the monkeys, so it is more attractive to potential partners
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The study of the international team It found that the calling frightened cry of howler monkeys, perhaps indicative of their reproductive disease. Scientists believe that the primate of the above form is given to develop a loud voice, or large balls. On his curious results the researchers reported in the publication «Current Biology».
Photo: dmitralex.ru.
The experts came to the conclusion, before the howler is usually a tough choice – either voice or testicles – but all at once is not seen.
These evolutionary “compromise” may be more common than previously thought.
These monkeys were called Howler due to their intrinsic sharp roar.
His cries are seeking to intimidate natural competitors and to get accustomed to females.
The possibility of such a formidable roar arises from the bone in the throat, serving cavity.
The vocal cords howler monkeys act as the strings of a certain anatomical tool and their hyoid bone has been working as a kind of tool.
After watching howler, experts have noticed that the biggest hyoid they have more of the smallest in the fourteen times.
The researchers scanned more than two hundred hyoid bone howler from museums in Europe and the United States.
Also, experts have revealed a strange inverse proportionality of the bone relative to the testicles.
The scientists realized that the difference in the size of monkey testicles is very significant. The largest are 6.5 times more than the smallest.
The study found that howler looking for a compromise between good vocal abilities, and large eggs for more semen volume.
With regard to the conditions of reproduction monkey choose any of the symptoms to develop.
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