Some ants take over others' colonies and use them for workers.
Here, you have a possessive form: some ants take over colonies belonging to some other ants.
- In order not to repeat the word "ant," "some other ants" was simply replaced by "others."
- In order to express the possessive without having to write "belonging to," you can add 's after the subject (the "possessor," if you will). However, when the subject is plural, like ants, you do not need to repeat the s after the apostrophe.
