In many parts of the world, grasshoppers are considered food for people. Why can eating grasshoppers be dangerous?
There are a couple of dangers in eating grasshoppers. First, some of them, like this Eastern Lubber, are toxic. Eastern Lubbers can cause opossums to be violently ill, and can be fatal to some birds.
Second, many grasshoppers play a part in the life cycle of tapeworms, so eating them raw can be hazardous. If you are going to eat grasshoppers, cook them well first.