What are some idioms and proverbs that mention animals?

Many idioms and proverbs incorporate animals to convey wisdom or observations about life. For example, "a bird in the hand is worth two in the bush" emphasizes valuing what you have over what you might gain. Another is "the early bird catches the worm," which highlights the benefits of being proactive. Additionally, "you can't teach an old dog new tricks" suggests that it's difficult to change established habits.