Learn Turkish: Vahşi hayvanlar bazen çok saldırgan olabilir. - Wild animals can sometimes be very aggressive.

The word is built from the verb saldırmak (to attack). The suffix -gan (or -gen, -kan, -ken) is added to verbs to describe someone or something that has a habit or tendency of doing that action. So, saldırgan literally means "prone to attacking," which translates to "aggressive."

Does the tendency suffix in saldırgan always start with a "g"?

No, it follows consonant mutation rules as well as vowel harmony. Because the root saldır- ends in a voiced consonant (r), it takes -gan. If the root ended in a voiceless consonant (such as ş in çalış-), the suffix would mutate to start with a "k", giving us words like çalışkan (hardworking).

Why is the verb olabilir in the aorist tense instead of the present continuous (olabiliyor)?

The aorist suffix -ir is used here because the sentence expresses a general fact or a timeless possibility about wild animals. If we used olabiliyor, it would sound like we are observing a specific, temporary situation happening around now.

The subject is plural (hayvanlar). Why doesn't the verb have the plural suffix (olabilirler)?