I saw a documentary recently featuring close-up camera footage of insects walking on plant leaves, etc. There was sound that I could interpret as originating from the bugs, but how would I know? It actually could have been anything if put together well. But, humor me, what kind of mic would, in fact, be able to pick up such tiny sounds? My Earthworks QTC50 covers 4 to 40k hz, but is a little noisy. A Rode NT-1A is low noise, but picks up fewer transients.