Hello, I'm an expert in entomology, the study of insects. When it comes to the question of whether beetles are deadly, it's important to note that the vast majority of beetles are harmless to humans. However, there are a few exceptions where certain species can pose a threat, either through their defensive mechanisms or by being vectors for diseases.

The most notable example of a potentially harmful beetle is the blister beetle, which can secrete a chemical called cantharidin. This substance is toxic and can cause severe skin irritation and even blistering if it comes into contact with the skin. Ingesting cantharidin can lead to more serious health issues.

Another example is the Colorado potato beetle, which is a significant agricultural pest and can cause damage to crops, but it is not harmful to humans.

It's also worth mentioning that some people may have allergic reactions to certain beetles, just as they might to any other insect.

In summary, while most beetles are not a threat to human health, there are a few species that can be harmful if they come into direct contact with humans or if their habitats are disrupted in a way that affects the ecosystem.

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An African leaf beetle, Diamphidia simplex (Chrysomelidae), exudes a poison that causes death by paralysis. African bushmen use this poison on their arrow tips to kill animals. Many species, including Coccinelidae (lady beetles) and Meloidee (Blister beetles), can secrete poisonous substances to make them unpalatable.read more >>