https://www.vice.com/en_us/article/m7gvzp/cats-are-an-alien-invasive-species-poland-declares

The Polish Institute of Nature Conversation has added domestic cats to its database of "invasive alien species," causing a firestorm as cat lovers in the nation push back on the decision. 

Cats—technically, felis catus—were added to the list earlier this month, the Associated Press reported on Tuesday. According to a blog posted by the institute due to the "controversy" over the decision, cats have a negative effect on local wildlife (birds, for example) and are technically not native to Poland.