If retrocediéramos in time 475 million years to the Ordovician, we would see that our planet Earth is totally different as we know. It is very hot, and it's easy to find places with temperatures exceeding 50 º. The continents were all together and formed what is known as Gondwana, an enormous supercontinent, and therefore, if there was a supercontienente also had a superocéano called Panthalassa, meaning "all the seas".

Most would find animal life in the sea, and of course, we would not find, orcas, whales or sharks, or even, similar animals. Arthropods and vertebrates ruled the prehistoric seas and began to emphasize vertebrate species timidly, promised much for its featuresin particular the spine.

One of the first was the Arandaspis marine arthropods, one of the first fish that descended from Pikaia and that would lead to the wide range of armored fish as Dunkleosteus.

This aquatic fish, just have information. It was found some 60 years ago in Alice Spings, Australia and its name comes from the tribe that inhabited those lands (Aranda). It was about 15 cm and started having bony plates on the body that gave some protection, began to form the shield would then armoured prehistoric fish.

These fish were small, and a feature of them was that they had jaw (some experts think they did have), only a small, hard lips that helped him to swallow everything that was while prospecting in search of food. In our view, it would seem a tadpole, but bigger and harder. Anyway, as I introduce you to one of the first vertebrates to have lived on Earth and apparently, succeeded because it appeared a large number of new species.

Giant baboon

We all know that we come from Australopithecus, one of our ancestor that lived about 3 million years ago in the African plains. Was the size of a chimpanzee, maybe a little bigger, and the main feature is that it walked on two legs. For this ancestor must be careful lest he deal with large hyenas, lions giants, especially with a cousin who still have descendants today: giant baboon (Theropithecus brumpti).
Baboons (or Papios) current are very fierce, in some cases, a male only stood up to leopards weighing more than twice and have formidable weapons ... imagine what they can do in droves. As for weapons, the baboon is a wonder: is agile, fast, fierce fangs and has serious injuries that may infringe their predators. They do not usually spend more than 40 kg, and usually live in herds gathering, are omnivores. Peaceful coexistence is with them, and that is why coming up and impalas graze beside ... until suddenly, they go crazy, they catch a baby impala and cut up to bite. The same goes for other animals such as hares, rabbits, small antelopes and birds.

3 million years ago, our ancestor, Australopithecus could be eaten by giant baboons, as current devour small antelopes. They lived in the same places and in some ways were rivals and as rivals, Austra had much to lose. While Australopithecus could reach 60 or 70 kg in weight, the Giant Baboon exceeded 200 kg. And while standing Australopithecus measured 1.3 meters, the Giant Baboon reaches 1.90 or 2 meters. So these two (the Australopithecus and the Giant Baboon) shared resources, but perhaps, once the big fish ate the kid ....

Perhaps 3 million years ago, we would see a pair of giant baboons on a zebra, trying it down to eat it and it could be a zebra or hyena or a leopard, or a wildebeest, or maybe a monkey smaller but more important in human evolutionary history .... Australopithecus.
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