because it killed loads
Because some snakes are poisonous.
Poisonous snakes are dangerous so stay away from them.
A material, other than a gas, that is known to be so toxic to humans that it poses a health hazard during transportation, is a regulated hazardous material (dangerous good) in Division 6.1 Poisonous Material.
The spider is probably a black widow, they are dangerous because they have extremely poisonous venom
Wall lizards are not poisonous or dangerous to humans. They are non-venomous and generally not aggressive towards humans. However, like all wild animals, they may bite if they feel threatened or cornered, so it's best to observe them from a safe distance.
So that you won't inhale anything poisonous.
HCN gas
The anaconda is not poisonous. It crushes prey and has long fangs so its just as dangerous.
it dangerous for the people that can't swim and ..
Haitians. They're the most dangerous animal in Haiti.
The frogs and toads have poisonous venom and can kill a man in 3 days.
The flesh of some coral reef fish that the great barracuda eats is poisonous and so the barracuda's flesh becomes poisonous too. This may explain why barracudas in some areas are poisonous, while those from elsewhere are perfectly safe to eat.