"The hens are big and fat."

[pepyta333]

Why not "mare"?

[potestasity]

Adjectives need to agree in gender and number with the noun. "Găinile" is plural, but "mare" is singular.

[pepyta333]

Ah, thank you, I thought it was plural feminine. :)

[jonquille22]

What is the difference between the given answer and "Puii sunt mari și grasi?"

[EmmaMitche89062]

Not much, except that "puii" means "the chickens" and "găinele" means "the hens".