Difference Between venomous and non venomous snake bite?

Venomous

Character          Venomous

Shape of head:   Usually have Triangular shaped or diamond shaped head.

Pupils:                Elliptical pupil

Pit:                     Having a hit sensitivity pit on the head

Scales:               undivided single subcaudal scales                                                                                   

Tail:                   compressed

Bitemarks:         fang marks

Swim in water :  Most of the body afloat

Non -Venomous

 

Character          Non -Venomous

Shape of head:  Usually round shaped

Pupils:               round /pupil  or circular

Pit:                   Often do not have a heat sensing pit on the head

Scales:             double row subcaudal plates                                                                                  

Tail:                  not much compressed

Bitemarks:        two rows of teeth marks

Swim in water: often only head showing