What distinct feature immediately recognizable on *Cerastes cerastes* gives it its common name?

Answer

The distinct supraocular "horns"

The Saharan horned viper is immediately recognizable due to the supraocular projections above its eyes, which are referred to as 'horns' and provide its common name.

What distinct feature immediately recognizable on *Cerastes cerastes* gives it its common name?
taxonomyreptileviperSahara