"El cerdo fue a México para aprender español."
Translation:The pig went to Mexico to learn Spanish.
Para + infinitive of a verb is standard phrasing in Spanish.
In this usage, "para" means "in order". So, formally stated this says "The pig went to Mexico in order to learn Spanish."
In English, we almost always drop the "in order" to keep things simple.
Sentences like these make you stop and think twice about the answer and I love the humour but introducing farm based words like barn...field... bucket...piglets....farming would be really useful here too.
I don't know if the answer is given somewhere else, but I would like to know which animals the Spanish use to describe humans - in English and German you have the stupid / lazy cow, the filthy pig, the silly goat - are they used the same way in Spanish? What other animals are used for their traits to describe humans?