PROBLEM TO BE SOLVED: To obtain the subject stomach poison having excellent attracting effect on harmful small animals, especially ants, by using a specific substance as an attracting substance optionally in combination with an insecticide. SOLUTION: An egg is used as the attracting substance of the objective agent. A stomach poison for harmful small animal exhibiting high attracting effect as well as controlling effect can be produced by using preferably 1-40wt.% of an egg and 0.01-10wt.% of an insecticide. The egg to be used as the attracting substance is bird egg such as hen's egg and crane egg or egg of fish, reptiles, etc. The egg may be used as it is or in dried state. Silafluofen is suitable as the insecticide from the viewpoints of high insecticidal effect and safety and low repelling action. The ratio of the egg to the insecticide is preferably about (2-4,000):1. The stomach poison exhibits high attracting effect not only on ants but also offensive vermin such as millipede, galley worm and wood louse.
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