I am so sorry it has no chance of competing
Sickness-causing microbes are fairly selective on their targets and as I understood the topic was to pit the groups against each other...

...now a small vial of Clostridium Botulinum, that'd be a different thing alltogether

You get the idea

I have access to said pathogens =D

But you don't want Clostridium. If you get infected, chances are that antibiotics won't work. And you'll need what we call a "faecal transplant". And trust me, you don't want that.

And endo... I'm pretty sure I'm right.
They're all the same species, just Brown Bears.
The only difference between them are nutrition, exersize, and climate.
I think if you put a family of small European Brown Bears in the Kodiak islands... they'll have access to that cold, windy weather, lots of food, and little need of exercise. So they'll grow fat, tall, and muscular.

The Grizzlies tend to travel far distances for less food, so they're much more smaller than Kodiaks. However, there's been heaps of instances of Grizzlies surpassing the size of Kodiaks. And heaps of Kodiaks surpassing their regular size too.

So perhaps we could come to a compromise?
Say a large Brown Bear instead.
Oversized Kodiaks and Polar Bears are deadlier, but if they weigh x2 more and are only 30% more dangerous... it doesn't seem like a worthwhile trade off.

But yeah, do you think 5-6 oversized Pumas can take out 2 large Brown Bears...?? I can't decide, I sort of think it could go 50-50.

...the kodiak the grizzly and the coastal brown ...They are all technically unique subspecies of brown . So you and I are both completely right kangal
I think the 5-6 kitties versus 2 teddies ..will look good..at 1st for the cats....the kitties'd circle ...the teddies would stick together and tighten up closer......a kitty would get too close...(even if you just airlifted and dropped the cats directly ontop of the bears ...the bears would still have no prob shrugging them off..I don't think their claws would get anywhere near the skin of the bear..teeth may have the same prob....you need more cats...as is....it's almost a fair fight) ...and then it's kitty-bits everywhere....

Dinosaurs?

That's like saying "Mammals?"
You need to specify a certain species, like Tyrannosaurus Rex for example...

Dinosaurs?
ooooh!...
well if that is the case ...there is only one dinosaur more dangerous than allllll others.
the one with the "thagomizer"

In a cage death match (tag-team-style) I'm pretty sure team I vs G would end up in the final. The only team that potentially could intefear with that would be team A depending on how effective a snake would be vs huge Animals...but I doubt the poison would be enough...

A chicken is (technically) a dinosaur. You want me to include chickens?

YES!
I can take a chicken!
Its really the only one on the list that I will receive at worst minor peck wounds to my person AND is small enough to haul home and get that sucker on the barbie...
yes the dominator...
the horrifior ...
the t-rex descendant!
the fearful, terrifying and ominous (yet tasty) chicken...
with a good BBQ sauce...
and a side of salad...
garden maybe.

Sure...let's say 100 chickens vs 1 bear covered in feed....bear won't stand a chance