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The names of male humans and male animals are almost always masculine, for example:
    o irmão = the brother
    o leão = the lion

The names of female humans and female animals are almost always feminine, for example:
    a irmã = the sister
    a leoa = the lioness

The name of the months of the year are all masculine, for example, o mês de... (the month of...)
    março = March
    abril =  April
    maio =  May

The names of oceans, seas, lakes and mountains are usually masculine, for example:
    o Pacífico = the Pacific
    o Amazonas = the Amazon
    o lago Huron = Lake Huron
    o Alpes = the Alps