In 1963 the fence bordering the Kruger National Park was upgraded to meet international standards and was proclaimed proficient against the threat of foot and mouth disease in the park. The migration of larger game was severely restricted. Elephant, buffalo, lion and hippo now had extremely limited access to crops and farmers could invest more into their produce as the threat of them being destroyed by wild animals was minimal. Cattle were a popular choice as the threat of them being eaten by predators was now much less than before (although it still occurred).