Our endocrine system is very bossy. It controls many things in our bodies, like growth or mood. Sadly, there are chemicals that interfere with this important system. Endocrine-disrupting chemicals are all around us. Their negative effects can even pass on to future generations. How does this happen? We reviewed many articles on endocrine disruptors and their effects on various animals. These chemicals have negative effects on fish, frogs, birds and mammals. Sometimes the effects pass on to many generations. However, the mechanism for this transfer is not genetic but most likely epigenetic.