I just turned off the heat lamp for my ducklings for about a minute. In that time I reached in to grab one and was very surprised that none of them were running away. I tapped on their heads, gently pushed them around and even picked one up. Either they got over their deadly fear of humans or they just thought my hand was another duck. Turns out it was probably the latter because I turned the lamp back on while simultaneously petting one on the head and they all immediately saw that it was actually my hand and ran away in terror.