Ratatoskr is a character from Norse mythology, depicted as a squirrel that resides in the world tree, Yggdrasil. This tree connects the nine realms of the universe. Ratatoskr's primary role is to carry messages and insults between the eagle perched at the top of Yggdrasil and the serpent, Nidhogg, who dwells at its roots. The actions of Ratatoskr symbolize the communication and conflict between different realms and beings in Norse cosmology. By relaying messages, Ratatoskr plays a crucial part in the interconnectedness of the universe, highlighting the importance of communication in maintaining balance among the realms.