re: If every animal species (including insects) weighed 200 lbs…

The Praying Mantis would be one of the top killers for sure. But I just learned about the Bombardier Beetle.

[quote]The bombardier beetle then blasts its would-be predator with a chemical mixture that can reach up to 22 miles per hour at 100 degrees Celsius (212 degrees Fahrenheit?), When the bug is threatened, it touches the match to the fuel, which then forces its way out of an exit channel in it’s rear end. In order to figure out why the bombardier beetles don’t just explode, the scientists used ultrafast x-ray imaging to capture the moment the beetles pulled the trigger. They discovered that the beetle’s defense acts less like a missile launcher and more like a machine gun, firing between 368 and 735 pulses per second./quote]

Smithsonian