This is the 12463rd most frequent Russian word.
китов
"Китов" is the plural form of "кит," meaning "whales" in English.
Here, 'китов' is used in the genitive plural form of 'кит' (whale), referring to multiple whales in an enumerative sense.
На экране показывали группу китов, плавающих в океане.
The screen showed a group of whales swimming in the ocean.
In this sentence, 'китов' is the genitive plural form, showing possession or association with the feeding habits.
Исследователи изучают привычки питания китов в разных регионах.
Researchers are studying the feeding habits of whales in different regions.
Here, 'китов' again is in the genitive plural, used to specify the object of rescue actions in the narrative.