This is the 18214th most frequent Russian word.
черных
"Черных" is the genitive or accusative plural form of "чёрный," meaning "black" (color) or "of black."
"Черных" is an adjective in the plural genitive form modifying "силуэтов."
В лесу он видел много черных силуэтов.
In the forest, he saw many black silhouettes.
"Черных" is an adjective in the plural genitive form modifying "кошек."
Черных кошек в деревне боятся больше всего.
Black cats are feared the most in the village.
"Черных" is an adjective in the plural genitive form modifying "людей."