Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.007A.

Section : Dead animals that have no running blood.

(That is) bees, ants, and so on. They are considered pure. If they fall into some substance and die, the substance will not become impure. Ibn al-Munzhir said, “I do not know of any disagreement concerning the purity of such water save what has been related from ash-Shaf’i. It is well-known that he views them as being impure. Nevertheless, it does not bother him if the object falling into a substance does not alter it (in any way).”