How to Say "beast" in Spanish
The most common Spanish word for “beast” is “animal” — use 'animal' when referring to any creature, especially in a general or literary context, or when the 'beast' implies something less wild or even slightly negative..
animal
/a-ni-'mal//a.niˈmal/

Examples
El perro es un animal doméstico muy leal.
The dog is a very loyal domestic animal.
Estudiamos la vida de los animales en el bosque.
We studied the life of the animals in the forest.
Según la biología, todos somos animales.
According to biology, we are all animals.
Fixed Gender
Even though a creature might be female, the noun animal itself always stays masculine (un animal).
Using the wrong article
Mistake: “La animal es peligrosa.”
Correction: El animal es peligroso. (Remember to use 'el' because 'animal' is a masculine word.)
bestia
/BES-tyah//ˈbes.tja/

Examples
El león es una bestia imponente en la sabana.
The lion is an imposing beast on the savanna.
Tuvimos que mover la valla para que pasara la bestia.
We had to move the fence so the large animal could pass.
Always Feminine
Even when referring to a male animal (like a bull or a male lion), 'bestia' is always a feminine noun ('la bestia').
bicho
/bee-cho//ˈbitʃo/

Examples
¿Qué bicho es ese? Parece un perro gigante.
What animal is that? It looks like a giant dog.
Nuestro gato es un bicho perezoso que solo duerme.
Our cat is a lazy critter that only sleeps.
monstruo
MOHN-stroh/'monstɾwo/

Examples
El monstruo marino tenía ojos rojos y dientes afilados.
The sea monster had red eyes and sharp teeth.
Pensaban que había un monstruo viviendo en el pantano.
They thought there was a monster living in the swamp.
Gender Note
Even though 'monstruo' ends in 'o', it can refer to a creature of any gender (male or female). You always use the masculine article: 'el monstruo'.
bruto
/broo-toh//ˈbɾuto/

Examples
Ese hombre es un bruto, no tiene modales.
That man is a brute, he has no manners.
Animal vs. Human 'Beast'
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