One of the most remarkable animal migrations is that of the monarch butterflies. These delicate insects travel thousands of miles from North America to Central Mexico, where they huddle together in dense clusters. Salmon are also known for their epic migrations, swimming upstream from the ocean to their natal freshwater streams to spawn. Humpback whales journey thousands of miles between their feeding and breeding grounds, showcasing the majesty of marine migrations. These migrations remind us of the incredible lengths animals will go to ensure their survival and reproduction.