Why is it that most nasty poisonous biting things evolved in hot climates?

Question

I think that because nasty poisonous biting things are cold blooded (well apart from ex-wives, but that statement is a matter of opinion) and they had lots of sun, the buggers were free to swan about evolving into more and more nasty things.

Answer 1

Prey are often harder to come by in extreme climates. Therefore, organisms have evolved special methods to capture prey (like poisons) in these environments. That's why many of the most poisonous organisms can be found in Africa and Australia.

Answer 2

The milder living conditions in hot climates allow many more animals to evolve, period. Due to that, competition is much fiercer and so many of the animals had to evolve very effective defensive and offensive systems.

In the colder climates, there is just not that much competition, so less pressure to evolve that way.

Answer 3

its because the most poisonous of animals, are repitles which need warm enviroments. also they are small so they dont have huge claws or anything to protect its self. it need some kind of defensive measure so it has venom