If you look at this photo closely (tip of the duckling's bill), you'll see that this duckling is about eat some type of flying bug. I took this photograph using my Nikon D850 with a Nikkor 300mm 2.8GII ED lens along with a Nikon AF-S 2x teleconverter. My settings: ISO 560, 600MM, F/5.6 @ 1/2000 sec.