Who would win: every human in the world vs. every animal in the world?
I'm thinking the animals would easily defeat us, since trying to get all 8 billion+ humans to agree on a plan of attack would be a near-impossible task. By the time we'd be done trying to coordinate a plan, I figure the lions and cheetahs would have already devoured us, not to mention the larger animals like the elephants.
Even so, I think we shouldn't underestimate the smaller creatures like rodents and insects. Most of them carry diseases, so if they came in large numbers, they could easily wipe out a good percentage of humans.
However, if humans were allowed to use the military's weapons, like tanks and canons, I think we might have a fighting chance. But if we went straight to using the nukes, it would result in no winner since the whole planet would die.
Would the animals win, due their sheer numbers and combined strength? Or would the humans win because of our combined intellect and vast knowledge of the animal kingdom? What do you think?
If you include insects and arthropods and everything suddenly turns into uberbloodlust-kill-all-humans then non-human animals win, hands down. I think people overestimate their ability, the effectiveness of weapons, and the sheer number of insects that are near you at all times. Insect biomass alone outstrips humans by an insane margin. Very few mammals or other animals would get a lick in, I think. There is no hermetically sealed bunker that would hold for long, and that won't save you from the mites already on your skin although they probably can't do a ton of a damage.
Mosquitoes are the only thing that kills more humans than other humans. In fact, if you look at the top 10 animals that kill humans and add up 2-9s per year totals they're a bit less than mosquitoes. Also the list is very bug and parasite heavy.