How to Say "beaver" in Spanish
The Spanish word for “beaver” is “castor” — B1 level.

Examples
El castor construye una presa en el río.
The beaver is building a dam in the river.
Los castores tienen dientes muy fuertes para cortar madera.
Beavers have very strong teeth to cut wood.
Antiguamente, los sombreros de castor eran muy populares.
In the past, beaver hats were very popular.
One word for both genders
In Spanish, 'castor' is a masculine word even if the animal is female. If you need to be specific about the animal's sex, you say 'el castor macho' (the male beaver) or 'el castor hembra' (the female beaver).
Plural form
To make 'castor' plural, just add '-es' at the end because it ends in a consonant: 'los castores'.
Castor Oil Confusion
Mistake: “Using 'aceite de castor' exclusively.”
Correction: While 'aceite de castor' is used (mostly in Latin America due to English influence), the traditional and most common name for castor oil in Spanish is 'aceite de ricino'.
Related Translations
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