viṣakṛmi nyāyaḥ (worms living in poison)

Some worms are born and live in high poisonous matter.

What one being's food is for another a poison. In Bhagavad-gītā living entities are described as sarva-gataḥ. That means they live everywhere. They live in water, on the bottom of the ocean, within the earth, wood, stool, fire, or in subtle elements like ether, mind, intelligence, and false ego. Therefore it is no wonder that they live also in poison. Actually, the poison is like nectar for them.