Disney has produced some of the world’s best-loved animated films. From traditional hand-drawn 2D animation to photorealistic CGI, and from Steamboat Willie to the upcoming Moana 2 and Mufasa: The Lion King, it has brought a host of memorable characters to life on the big screen and continues to delight audiences.

Behind this vast collection of movies lies a whole range of animation techniques. But several secrets that have emerged over the years that have really surprised us. As we await the release of Inside Out 2 next month, here’s our pick of the most surprising Disney animation secrets we’ve covered (for inspiration for your own work, don’t miss our expert character design tips and our piece on Disney’s 12 principles of animation.