Learn Turkish: Leylekler güneye göç edebilir. - The storks might migrate to the south.

This verb combines göç etmek (to migrate) with the possibility suffix -ebil and the aorist tense suffix -ir. While this exact same grammatical structure is used to say 'can migrate' (ability), in this context it expresses epistemic possibility, meaning there is a probability that they will migrate ('might' or 'may').

Why does the t in etmek change to a d in edebilir?

This is a standard consonant mutation. The verb root is et-. When it is followed by a suffix that starts with a vowel, like the possibility suffix -ebil, the hard t softens into a d to make it easier to pronounce.

Why is the dative case used in güneye?

The noun güney means 'south'. Because the verb göç etmek implies physical motion towards a destination, the destination requires the dative case suffix -e (to/towards). This gives us güneye, meaning 'to the south'.

Since Leylekler (storks) is plural, why isn't the verb pluralized as edebilirler?