What is the indefinite article for toro, toros, gallina, gallinas, vaca, vacas, pajaro, pajaros, perro, perros, gallo, gallos, cerda,…

What is the indefinite article for toro, toros, gallina, gallinas, vaca, vacas, pajaro, pajaros, perro, perros, gallo, gallos, cerda, cerdas, gata, gatas, cerdo, cerdos, pez, and caballos?

 
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