In the New World, according to Prescott, King Nezahualcoyotl had zoological gardens at Tezcuco in Mexico in the middle of the 15th century, whilst in the next century Cortes found aviaries and fishponds at Iztapalapan.
The fishponds often hold Goosander and Smew in the winter, and there is a heronry and colony of nesting cormorants here.
The field was presumably more valuable for pastoral uses, and for the fishponds surmised to have been here.
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