““In the case of one who establishes his sukkah at the top of a tree or atop a camel, the sukkah is valid, but one may not ascend and enter it on the first Festival day because the Sages prohibit climbing or using trees or animals on the Festival.””
— Talmud Bavli, Masechet Sukkah 22b
FYI in case your thinking about building your Sukkah on your 🐫 this year.