Learn Spanish (Spain): Ayer vi muchas aves marinas en la playa. - Yesterday I saw many marine birds on the beach.

ave is actually a feminine noun. In the singular, it takes the masculine article el (el ave) to avoid the awkward double 'a' sound of 'la ave', because the first 'a' in ave is stressed. But in the plural, the 's' in words like las or muchas breaks up those sounds. So, it goes back to normal feminine rules: muchas aves marinas.

Why doesn't the past tense verb vi have an accent mark?

vi is the 'I' form (first-person singular) of ver in the preterite tense. Because it is only one syllable, it doesn't need a written accent mark. Spanish only puts accents on one-syllable words to tell them apart from other words with the same spelling (like tu and tú).

Is there a difference between using aves and pájaros for 'birds'?

Yes! ave is a general, slightly more formal word for any bird, and is standard for categories like aves marinas (seabirds) or birds of prey. pájaro is typically used for smaller, perching birds or songbirds.

Why does the Spanish sentence use en la playa for 'on the beach' instead of a word that specifically means 'on'?