"Depending upon the species, mosquitoes can fly at about 1 to 1.5 miles per hour. Mosquito species preferring to breed around the house, like the Asian Tiger Mo

"Depending upon the species, mosquitoes can fly at about 1 to 1.5 miles per hour. Mosquito species preferring to breed around the house, like the Asian Tiger Mosquito, have limited flight ranges of about 300 feet. Most species have flight ranges of 1-3 miles." So ... you're probably not going to beat ~billions of years of evolution, in terms of power to weight ratio and efficiency, right ? So let's use the mosquito as a baseline and stipulate that what you gain by stripping away the reproductive and digestive systems, you lose back by adding an offensive payload, so that's a wash. And you end up with something that has a range of ~2 miles and can fly about 1 mph. And also we're already evolved to hear and see objects of this size (and smaller). If you make them larger, to carry more payload, not only do you start down this vicious cycle of greater size to support more payload (see: adding more battery weight to an electric car to increase the range, but diminishing returns because you added more weight...) but you also end up with a larger "bug" that's even easier to notice. Or you could make them smaller, but now your range/speed drops even further. This is not to mention the issue of predators - albeit confused ones that probably just spit the drone out.