searching movement in a sentence

1. It can often be seen to move its head up and down in a searching movement to find the nipple.
2. The hypothesis has been supported in several of Sims'studies, presenting the possibility that optimal searching movements approximated by L関y patterns have evolved in organisms.
3. Her hand will make a short horizontal gesture similar to pushing something aside to indicate  no or a searching movement to indicate uncertainty.
4. It's difficult to find searching movement in a sentence.