Pufferfish blink by pulling in their eyeballs and puckering their skin
Pufferfish are the only bony fish that can blink – and they do so by sinking their eyeballs deep into their sockets and puckering the skin surrounding the eye together
Keisuke Ogimoto Shimonoseki Marine Science Museum Christa Lest Shimonoseki Marine Science Puffer Fish Fish Blinking
Source: newscientist.com