Yes, it can be ethical to keep pet lizards as long as they are kept in appropriate enclosures that meet their needs for space, temperature, humidity, diet, and enrichment. It is important for pet owners to do thorough research on the specific species of lizard they are considering keeping as a pet to ensure they can provide a suitable environment and care for the animal. Additionally, it is crucial to obtain lizards from reputable sources to avoid supporting the illegal wildlife trade.