"Lower rebirth" -- Are animals really "lower" than us?
Lower is not meant as a moral judgement nor a pejorative in this case. It is meant simply as a statement of the more dire predicament most animals are in compared to most humans. There certainly exist individual dogs, cats, horses, pigs, donkeys, monkeys, deer, sheep, cows, chickens, fish, birds, reptiles that are more compassionate and exhibit virtues superior to individual humans in this very life. However, generally speaking humans have a greater capacity for understanding dharma and opportunity to practice. Most animals are subject to base instinct and spend the vast majority of their time just trying to survive. In this sense it is called the lower or less fortunate realms.