REFERENCES

1. Some animals have different words for male and female.
Examples:

• el caballo (stallion), la yegua (mare)

• el toro (bull), la vaca (cow)

2. For some animals, you can create the feminine form by changing the ending from -o to -a.
Example:

• oso (male bear), osa (female bear)

Other times, the feminine form is different and needs to be memorized:

• el gallo (rooster), la gallina (hen)

• el tigre (tiger), la tigresa (tigress)

3. Some nouns are used for both the male and female of the species.
Masculine examples: el buitre (vulture), el calamar (squid), el caracol (snail), el cocodrilo (crocodile), el dinosaurio (dinosaur), el jabalí (wild boar), el pulpo (octopus)
Feminine examples: la almeja (clam), la cigüeña (stork), la codorniz (quail), la gamba (shrimp), la hormiga (ant), la jirafa (giraffe), la mosca (fly), la tortuga (turtle)