Guatemalan quetzal 5, 10, 20 and 100 quetzales, with quetzal notes added in 1933. In 1946, the Bank of Guatemala took over the issuance of paper money, with its first issues being overprints on notes of the Central Bank. Except for the introduction of 50 quetzales notes in 1967, the denominations of banknotes were unchanged until and 1 quetzal coins replaced notes at the end of the 1990s. In the top-right corner of the obverse face of each banknote, the value is displayed in Mayan numerals, representing Guatemala's cultural history. The Bank of Guatemala has introduced a polymer banknote of 1 quetzal
Golden-headed quetzal cavities from which part of the bird (head or tail) is usually visible. It can be difficult for the quetzal to find an appropriate site for their nest since the dead tree must be soft enough for them to carve but not too rotten as to be unable to support their nest. For this reason quetzals investigate multiple trees before finding a suitable site. The copulatory behaviour of quetzals is not well known since they appear to be discreet in their mating. The golden-headed quetzal has been observed breeding once a year between the months of February and June. The