Ibn Ezra on the Torah

"Knew the hunt." [Esau] was always full of deception, for most wild animals catch [their prey] using deception. But Jacob was the opposite of Esau because he was a "plain man." Esau was also a "man of the field." And Jacob "stayed in the tents." And it seems likely that its meaning is like "those who dwell in tents and amidst herds." (Gen. 4:20)

Meaning that, he endangered himself every day when he went out to hunt, that the animals might kill him, and it was possible that he would die before his father.