There is no single giveaway. The only way to be certain is to identify the general class of snake, and know which ones are venomous and which are not.
As a general rule, if you see a snake and are not sure what kind it is, leave it alone.
if it has a diamond shape head it is poisonous
You can research the species by its color and its length. If the snake has 'cat eyes' instead of round pupils, it is poisonous. That is not to say that round means it is not poisonous, as there are a few.
Most poisonous snake have fang.
No, the black rat snake is not poisonous.
I dont know, but i think its venomous, not poisonous.
the most poisonous is the beaked sea snake
I do not know , please tell me as well.
"What is the most poisonous reptile?"The most poisonous reptile is the Belcher's Sea Snake.---------------------------------------------------------------------------------------------------The Inland Taipan AKA Fierce snake is not poisonous at all. It is the most venomous however. No snake is poisonous. Venom and poison are two different things. Venom can do a multitude of harmful things to the body.
rattle snake
a venomous snake
cottonmouth snake
Water Moccasins are a poisonous snake. A very aggressive snake as well.