The French soldier was on a group patrol as part of a national protection program when he was attacked from behind, prosecutor Robert Gelli told Europe 1 radio.
The school's business and enterprise teacher Tim Williams said the cows were in an ideal place to give companies maximum exposure as Gelli Aur Country Park is popular with hundreds of visitors.
Guido Gelli, director of science at the Brazilian Institute of Geography and Statistics, told the Brazilian network TV Globo that today it could already be considered as a fact that the Amazon was the longest river in the world.