Mbh 3.177.2b

And then shouting and trampling on the tops of mountains, and causing the earth to resound with his roars, and striking his arms, and uttering his war-cry, and slapping and clapping his hands, Bhimasena, exempt from decay, and ever-proud and without fear, again and again leaped about in those woods. And on hearing the shouts of Bhimasena, powerful lions and elephants of huge strength, left their lairs in fright. And in that same forest, he fearlessly strolled about in search of game; and like the denizens of the woods, that most valiant of men, the mighty Bhimasena, wandered on foot in that forest. And he penetrated the vast forest, shouting strange whoopos, and terrifying all creatures, endowed with strength and prowess. And then being terrified, the snakes hid (themselves) in caves, but he, overtaking them with promptitude, pursued them slowly. Then the mighty Bhimasena, like unto the Lord of the Celestials, saw a serpent of colossal proportions, living in one of the mountain fastnesses and covering the (entire) cave with its body and causing one’s hair to stand on end (from fright). It had its huge body stretched like a hillock, and it possessed gigantic strength, and its body was speckled with spots and it had a turmeric-like (yellow) colour and a deep copper-coloured mouth of the form of a cave supplied with four teeth; and with glaring eyes, it was constantly licking the corners of its mouth. And it was the terror of all animated beings and it looked like the very image of the Destroyer Yama; and with the hissing noise of its breath it lay as if rebuking (an in-comer). And seeing Bhima draw so near to him, the serpent, all on a sudden, became greatly enraged, and that goat-devouring snake violently seized Bhimasena in his grip. Then by virtue of the boon that had been received by the serpent, Bhimasena with his body in the serpent’s grip, instantly lost all consciousness.