horses appeared in North America about 55 million years, over time, increased body size, reduced the number of fingers of their paws and developed big teeth. An international research team has conducted a thorough analysis of the teeth. By examining the wear patterns of the molars, this trait due to the feeding of animals throughout their history.
And the conclusion is that most of the oldest populations of horses the pressure to develop ever larger molars was weak, therefore, over those 55 million years, the horses, in evolutionary terms, what have had it easy.
6500 Scientists have analyzed 222 fossil different populations of over 70 extinct species of horses.
In the past million years has greatly reduced the number of species of horses and the diet is more restricted.
Petrosyan Rosana 1, Bach.B
Source: El Pais (newspaper digital)
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