This is the 704th most frequent Russian word.
животных
"Animals"
Here, "животных" is used in the genitive plural form to indicate possession or relation with 'behavior' (поведение).
Я люблю изучать поведение диких животных.
I enjoy studying the behavior of wild animals.
In this sentence, "животных" is the genitive plural form used to indicate quantities or existence (много).
В зоопарке много редких животных.
There are many rare animals in the zoo.
Finally, "животных" in the genitive plural form is used after the preposition 'о', showing the relationship with 'rights' (права).