Learn Turkish: Şu kartalın kanatları çok geniş olabilir. - That eagle's wings might be very wide.

The verb olmak (to be) takes the possibility suffix -abil followed by the aorist tense suffix -ir. While you have previously seen -abil used for physical ability (like "can"), when combined with the aorist tense, it frequently expresses a guess or probability. Here, it tells us that the wings "might be" wide.

Why is there an -ın suffix on kartal?

It creates a specific possessive relationship (genitive case). Because we are talking about the wings of a specific, pointed-out eagle (şu kartal), we must use the genitive suffix -ın to say "that eagle's". If we were talking about eagle wings in general, we would drop the -ın and just use the indefinite compound kartal kanatları.

Why use şu instead of o for "that eagle"?

Both şu and o mean "that", but şu specifically draws attention to something visible in your immediate surroundings that you are pointing out. O is used for things further away, out of sight, or previously mentioned. Using şu implies the speaker is looking right at the eagle as they speak.

Could olabilir also mean the wings "have the ability to be" wide?

Grammatically, the -(y)abil + aorist structure can express both ability and probability. However, Turkish relies heavily on context to separate the two. Since wings don't have the conscious ability to choose to be wide, the probability meaning ("might be") is the only one that logically fits this sentence.