Rashi: This is like Shukal. Shakul has the grammatical form of "Chanun v'Rachum ¹ " (Yo'el 2:13). It is totally dressed with bereavement, and it is prepared to bereave people.

Radak: If its children were killed, it is bereaved and bitter. If it finds a person or animal, it cleaves it quickly. Shakul is mentioned regarding a bear, but not regarding a lion or tiger, for a bear gives birth to pieces of flesh. The entire child is covered in a very thick fetal sac. The bear licks the sac and cuts it a little, lest it harm the child. It exerts greatly until all the flesh is removed and the child comes out. Therefore, it is more bitter [than other animals] when its children are killed.

Malbim: The second Chayah that Daniel saw was like a bear. It represents Malchus Madai.

Rashi #1: This is like a bear holds the chest with its fingernails and tears until the heart.

Rashi #2: Their heart is closed from understanding to return to Me. Radak - I will tear it. This is a Mashal. So a lion tears the body until the heart, and eats it and drinks its blood.

Malbim: This was in the days of Haman. They opened their hearts and repented.

Radak: There, in their cities, I will consume them with plague and the enemy's sword, like a Lavi tears without compassion. Also wild beasts will tear them, like it says "v'Hishlachti Vachem Es Chayas ha'Sadeh v'Shikelah Eschem" (Vayikra 26:22).

Malbim: This is in Galus Edom, the fourth Chayah [that Daniel saw] - "Achlah u'Madekah u'Sh'ara b'Raglah Rafsah" (Daniel 7:7 - it ate, grinded the food finely, and trampled the leftovers). I.e. in the days of all the exiles, it seemed to them that I tear them. This is wrong! The Chayah cleaves them. Since I hid My face, Chayos come against them.