You will need your tape measure for this one. With chalk on the sidewalk or driveway make a mark with the chalk and then measure out 20 yards or 60 feet (it also equals 720 inches) Depending on how long your tape measure is you may want to make marks every 3 feet which is one yard and mark them with numbers from 1 to 20. You are going to need a stopwatch for this one too. If you have a smart phone or tablet there may already be an application along with the clock feature, if not you can click here if you have a mobile device.
A House Sparrow flies at 20 mph and a Mallard Duck can fly 45-60 mph check this chart to see how fast you would fly.