1)
What do we learn from "Ki Vul Harim Yis'u Lo"?
1.
Rashi: This is "Behemos b'Harerei Alef" (Bava Basra 74b). Every day it consumes the vegetation on 1000 mountains (Tanchuma Pinchas 12). Ibn Ezra - Bul is like Yevul (produce, yield).
2.
Malbim: Kel will kill it, so the mountains will produce food for others. This animal destroys the mountains' yield!
2)
Why do animals frolic there?
1.
Ibn Ezra: They frolic with it, for it does not trample (it does not eat meat).
2.
Malbim: They will frolic there after he kills it. Now, all animals flee it amidst fear.
