Mamushi

It mainly inhabits forests near rivers and plains near rivers.
With a neutral mob, when a player approaches, it sways its tail and makes a menacing sound, and when a player attacks, it becomes hostile and attacks that player.
When attacked, it has a poisonous effect.
Moreover, the poison is not a normal poison, but a "extreme poison", and you will die if you do not drink milk.
When you die, it will be displayed as "(player name) has been bitten by a Mamushi".
Also, this mob has a habit of hiding in the bush, and when the player destroys the bush, a hostile pit viper will appear.
However, if you collect the bush with the pit viper with a silk-touch hoe, you can collect the bush with the Mamushi.
Naturally, when approaching a bush with a pit viper, it also makes a menacing sound by shaking its tail finely from inside the bush.
Even if you defeat it, you will only lose experience points, but if this mob and bush are added to Minecraft, it may tell the player the dangers around you.
I think we should add a lot of danger to Minecraft, which creates a lot of nature besides monsters, lava, and falling.
If you have any other good ideas, let us know in the comments.
Thank you for taking a look at my thoughts.