After 140 years in operation, the Buenos Aires Zoo in Argentina’s capital plans to move almost all of its 2,500 animals to natural reserves. Those animals too old or infirm to make the move will stay, but will no longer be kept on public exhibit. The zoo will become an educational eco-park where animals rescued from the illegal-trafficking trade may be helped and housed. According to The Guardian, Horacio Rodríguez Larreta, the mayor of Buenos…