This is the video I recorded when an Amano Shrimp tried to pick up the dead snail body from the shell.
However, with their big appetite, they would sometimes look for soft leaves or plants or even disturb the smaller fishes if they were hungry. I used to see them damaging the star grass leaves and they even climbed on to Oto catfish and tried to grab the Oto away!
That was how they munched on my delicate star grass leaves. :(
That being said, they would remain calm and peaceful should the tank has enough algae and food supply. So, if you see your Amano Shrimps keep running around and damage the plants or disturb other fishes, that means mostly they are hungry and looking for food. Just give them a slice of blanched zucchini or some smashed green peas, they will be alright. Hungry shrimps are angry shrimps! :)