Why You Have to Blink to Walk

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When we picture the first tetrapods, or land vertebrates, crawling out of the ocean, we probably imagine they need legs. But evolution also had to bestow another important adaptation before they could leave the water: blinking!

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Sources:
https://www.pnas.org/doi/full/10.1073/pnas.2220404120

Images:
https://commons.wikimedia.org/wiki/File:Elginerpeton_BW.jpg
https://www.gettyimages.com/detail/video/big-grouper-in-troubled-waters-swimming-above-seabed-stock-footage/1354888812?adppopup=true
https://www.gettyimages.com/detail/video/mudskipper-stock-footage/468397212?adppopup=true
https://www.gettyimages.com/detail/video/fish-head-talking-breathing-stock-footage/165476008?adppopup=true
https://www.gettyimages.com/detail/video/close-up-queensland-lungfish-stock-footage/1278809995?adppopup=true
https://www.gettyimages.com/detail/video/terrapin-in-jungle-closeup-stock-footage/814990272?adppopup=true
https://www.gettyimages.com/detail/video/portrait-of-a-woman-slowly-opening-her-eyes-while-stock-footage/1410432396?adppopup=true
https://www.gettyimages.com/detail/video/mallard-duck-head-close-up-at-the-edge-of-a-pond-stock-footage/1295240215?adppopup=true
https://www.gettyimages.com/detail/video/periophthalmodon-schlosseri-stock-footage/1369930985?adppopup=true
https://www.gettyimages.com/detail/video/mudskipper-stock-footage/503563969?adppopup=true
https://www.gettyimages.com/detail/photo/mudskipper-on-mud-flat-royalty-free-image/469540033?phrase=mudskipper&adppopup=true
https://www.gettyimages.com/detail/video/mudskipper-stock-footage/503563951?adppopup=true
https://www.gettyimages.com/detail/video/goby-and-shrimp-stock-footage/613458216?adppopup=true
https://www.gettyimages.com/detail/video/mudskipper-fish-habitat-stock-footage/987269754?adppopup=true
https://www.pnas.org/doi/pdf/10.1073/pnas.2220404120
https://www.gettyimages.com/detail/video/blue-spotted-mudskipper-stock-footage/1178114076?adppopup=true
https://www.pnas.org/doi/pdf/10.1073/pnas.2220404120
https://www.gettyimages.com/detail/video/slow-motion-footage-of-a-countryside-duck-shaking-its-stock-footage/1453649615?adppopup=true
https://www.inaturalist.org/photos/22286011
https://www.gettyimages.com/detail/photo/muddy-road04-in-high-contrast-low-saturation-royalty-free-image/491350158?phrase=mud+background&adppopup=true
https://www.inaturalist.org/observations/31464137
https://commons.wikimedia.org/wiki/File:Tiktaalik_roseae_life_restor.jpg
https://www.gettyimages.com/detail/video/the-common-toad-which-sits-in-the-water-has-only-a-head-stock-footage/1250183503?adppopup=true
https://www.inaturalist.org/observations/68736070