I love this epic button that looks like a hippopotamus and the eye follow your mouse movement and the ears wiggle and when you hover over it, the hippo opens its mouth. This button uses GSAP was designed by Mariusz Dabrowski and works well for a zoo or other animal-related websites.
If you are having trouble with the pen, try the archived copy on GitHub
Hippo Button Snippet
See the Pen Interactive Hippo Button by Mariusz Dabrowski (@MarioD) on CodePen.default