There are several venomous snakes where their scientific names start with "O", such as:
Inland Tiapan (Oxyuranus Microlepidotus).
King Cobra (Ophiophagus Hanna).
Common Taipan (Oxyuranus scutellatus).
Oleander
orgic ornoments
Olive Sea snake
Olive snake the full name of it is the olive brown sea snake
oscar
no.............................
O Henry
Ontario
Orangutan.
owen
ozone
Orbit