What lottery did He cast?
Rashi: Hashem caused that these will fall to the portion of those Chayos and birds.
Radak: It is as if He cast a lottery, that they will have an inheritance in the land.
Malbim: He gave to each a share, so each has an inheritance.
What is the meaning of "v'Yado Chilkatah"?
Radak: His hand divided the land to the Chayos and birds.
What is "b'Kav"?
Radak: This is a metaphor - like one who divides land with rope and a line. Malbim - this is a permanent division, with signs for the borders.
Why does it say "Ad Olam Yirashuha"?
Malbim: It will be theirs forever.
Why does it add "l'Dor va'Dor Yishkenu Vah"?
Malbim: Do not think that even though it will be theirs, they will not dwell there, like one who has an inheritance in this land, and he dwells in another land. They will forever dwell there.