Learn Turkish: Jestleri ve mimikleri çok doğal. - His gestures and facial expressions are very natural.

In Turkish, jest specifically refers to body or hand movements (gestures), while mimik refers exclusively to facial expressions. Both are loanwords from French and are very commonly used together as a set phrase to describe someone's non-verbal communication.

Why do jestler and mimikler have the -i suffix attached to them here?

The -i at the end of jestleri and mimikleri is the third-person possessive suffix. It indicates ownership, meaning "his" or "her" gestures. The full phrase would be onun jestleri ve mimikleri, but the pronoun onun is naturally dropped because the suffix already makes the ownership clear.

Could this sentence also mean "her gestures" or "their gestures"?

Yes! Because Turkish lacks gendered pronouns, the hidden pronoun onun could mean either "his" or "her". It could also mean "their gestures", because the suffix -leri can act as the third-person plural possessive (from onların). You would rely entirely on context to know who is being discussed.

Why is there no word or suffix for "are" at the end of the sentence?