The long thin head has a distinct canthus above the medium-sized eyes, which have round pupils and yellowish brown irises. When threatened or otherwise aroused, the western green mamba is capable of flattening its neck area into a slight hood.
This species is distinguished by its long, slender cranium with a prominent orbital ridge above the mid-sized peepers, which possess round pupils and yellowish-brown iris hues. Upon feeling threatened or otherwise agitated, the western green mamba can flatten its neck area into a subtle crouch.