They drew some ducks.
<br /><a href='https://en.wikipedia.org/wiki/G%C3%B6bekli_Tepe#/media/File:G%C3%B6beklitepe_Building_C_5372_(cropped).jpg'>https://en.wikipedia.org/wiki/G%C3%B6bekli_Tepe#/media/File:G%C3%B6beklitepe_Building_C_5372_(cropped).jpg</a>