Praying mantises feed entirely on live food - they need it to turn and resist. They mostly hunt on insect pests. So praying mantises help us preserve the harvest. However, a really hungry insect is not particularly discriminating and can also attack frogs, lizards, snakes, mice, etc.
Are they dangerous to humans?
Praying mantises are often kept as pets, they are not dangerous to humans. However, it is not recommended to tease and irritate the insect specially - after all, it is a predator. If he decides that you are a danger to him, then he may bite.
Certainly, the bite will not be fatal, but very painful.
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