Antorbital fenestra

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What Wikipedia says

An antorbital fenestra (plural: fenestrae) is an opening in the skull that is in front of the eye sockets. This skull character is largely associated with archosauriforms, first appearing during the Triassic Period. Among extant archosaurs, birds still possess antorbital fenestrae, whereas crocodylians have lost them.

Excerpt from the Wikipedia article “Antorbital fenestra”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dromaeosaurus_skull_uk.svg: AS derivative work: Berichard (talk), Public domain, via Wikimedia Commons.