Note 113 — SUPPLEMENT TO HARVESTING ANTS.

Speaking of the enemies of ants, I may mention having seen a young robin in England picking up and swallowing the workers of Formica nigra just as if they were crumbs. I knew that birds would eat the male and female ants, but I had thought the workers were exempt from their attacks, and, indeed, they must be so as a rule, for otherwise they would speedily become extinct.