Bitis arietans from Africa but they have hemotoxin -- slow working venoms .
Bitis arietans from Africa are russell 's viper and saw - scaled viper also bear resemblance to the swamp adder of the story .
Bitis arietans from Africa , Russell 's viper and saw - scaled viper also bear resemblance to the swamp adder of the story , but they have hemotoxin -- slow working venoms .