Introducing a new horse to a herd can be quite challenging, and it's great to hear that the process went relatively smoothly. It's interesting to learn about horse herd hierarchy and how it's communicated through movement and personal space. It's also good to know that there are ways to help calm horses during these transitions, such as using the best horse calming supplement. Thank you for sharing your experience, and I hope that Raiku, Velmu, and Monica will continue to get along well together.